Search database
Filter
3208
Text search: efficacy
Featured
Language
Document type
1727
592
471
144
93
89
40
20
14
10
4
3
1
Countries
140
128
82
80
63
60
56
52
51
45
45
44
43
41
39
39
35
32
30
29
27
25
23
23
23
22
22
22
22
21
21
20
19
18
15
15
15
15
14
14
14
13
13
11
11
10
10
9
9
8
8
7
7
7
6
6
6
6
6
6
6
5
5
5
5
5
5
4
4
4
4
4
4
4
4
4
4
4
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Authors & Publishers
545
224
153
138
72
63
58
41
33
33
26
24
24
21
20
18
16
14
14
14
13
13
13
12
12
11
11
11
11
11
10
10
10
9
9
8
8
8
8
8
8
8
7
7
7
7
7
7
7
7
7
7
7
7
7
7
6
6
6
6
6
6
6
6
6
6
6
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Publication Years
Category
1057
370
207
151
79
45
41
1
Toolboxes
366
322
273
194
154
127
121
90
90
74
61
60
59
31
22
21
21
16
16
14
13
8
7
1
Accessed November 2017
The main objective of the malaria prevention and control programme in Somalia is to prevent mortality and reduce morbidity due to malaria. The groups most vulnerable to the disease, children aged under 5 years and pregnant women, are especially targeted. Effective case management - early diagnosis a ... more
Accessed online January 2019, publication date unknown.
BMJ 2001;322:1–5

Treatment of psychostimulant dependence

World Health Organization (2012) C_WHO
Q3: Are pharmacotherapies safe and effective for the treatment of psychostimulant dependence (maintenance or relapse prevention) in non-specialized settings?
COVID-19 Infection Prevention and Control Sameeksha (Hindi; review) compiles recent key IPC resources on COVID from scientific journals, WHO guidelines, Ministry of Health and Family Welfare /Government of India guidelines, and trainings and IPC resources. The intended target audience for this inclu ... more
Journal of Cancer Education https://doi.org/10.1007/s13187-020-01935-7
Poster, 4 Janaury 2022
News Release 11 april 2022
At the forefront of DNDi’s efforts to develop new treatments is the need to understand the realities and treatment needs of patients and health care staff in the field. The ultimate goal for human African trypanosomiasis (HAT) is a truly simplified treatment which can be orally administered, impl ... more
Including Therapeutic Food, Dietary Vitamin and Mineral Supplementation - 2nd edition
HIV & AIDS Treatment in Practice No. 198

Practical Pharmacy for Developing Countries No.18

Bower, J. World Health Organization WHO (2008) C_WHO
The Panel recommendations on initial combination regimens for the antiretroviral therapy (ART)-naive, HIV-infected patients.
Q4: For people with dementia with associated depression, do antidepressants when compared to placebo/comparator produce benefits/harm in the specified outcomes?
Accessed on March 2014
The 6th edition of the essential medicine list has been developed based on the 5th edition list of essential medicines, the National Standard Treatment Guidelines and Protocols 2013, list of laboratory commodities and List of Consumables used in public health facilities.
Therapy for MDR-TB is extremely long, complex and burdensome to both patients and health care systems. A single diagnosis can require two years of treatment, or longer. When treating children, there are significant additional barriers treating children with MDR-TB. There is limited data on the pharm ... more
The Priority medicines for mothers and children 2011 list was updated following the 18th Expert Committee Meeting on Selection and Use of Medicines, the release of new treatment guidelines and feedback from partners following the 2011 version. In alignment with the UN Global strategy f ... more
Recommendations of the Healthcare Infection Control Practices Advisory Committee and the HICPAC/SHEA/APIC/IDSA Hand Hygiene Task Force
The COVID-19 Vaccine (Whole Virion Inactivated) BBV152, COVAXIN® vaccine explainer includes key information on the vaccine specific requirements.
Q 1: Are antidepressants (Tricyclic Antidepressants (TCA) and Selective Serotonin Reuptake Inhibitors (SSRI)) better (more effective than/as safe as) than treatment as usual (placebo) in adults with depressive episode/disorder?
Chapter 105
The report presents current information (updated to September 2015) on candidate vaccines, therapies and medical devices for Ebola and gives an overview of completed and on-going trials.
Afr J Tradit Complement Altern Med. (2016) 13(4):123-131
Out of 400 questionnaires distributed to the participants, 389 were returned with data acceptable for analysis. Ages of the participants ranged from 18 to 75 years (Mean=43 + 11.6). Out of the 272 (69.9%) participants who conceded that th ... more
Interim Technical Note
This guideline is intended to provide requirements to applicants wishing to submit applications for registration of medicines in Botswana.
Document No. : FDA/SMC/SMD/GL-RAR/2013/01
PMPB/INS-GUIDE/02
First Edition
Made under Section 5 (c) of the Tanzania Food, Drugs and Cosmetics Act, 2003 | Second Edition
Int. J. Mol. Sci. 2017, 18, 341, 1 - 10
Rewiew Article Hindawi Publishing Corporation, Tuberculosis Research and Treatment; Volume 2011, Article ID 712736, 6 pages, doi:10.1155/2011/712736
Review Triccas and Counoupas Pneumonia (2016) 8:18; DOI 10.1186/s41479-016-0020-z
Updated to Reflect the 2009 Medical Eligibility Criteria of the World Health Organization
Long-lasting insecticide-treated nets and/or indoor residual spraying, associated with case management, are key interventions in the control of malaria in Africa. The objective of this study is to comment on the role of social and behavior change communication as a potential key intervention in t ... more
Update 27 Agusut 2018
A new formulation of a drug to prevent excessive bleeding following childbirth could save thousands of women’s lives in low- and lower-middle-income countries, according to a study led by the World Health Organization (WHO) in collaboration with MSD for Mothers and Ferring Pharmaceuticals. Curren ... more
This is an updated introductory two-page document that defines AIDS vaccines and reviews key developments in the field.
These guidelines have been developed for scientific purpose with the main aim to guide the regulatory authority for evaluating probiotic products in our country.
Q5.SCOPING QUESTION: In individuals with psychotic disorders (including schizophrenia) who require long-term antipsychotic treatment, what is the safety and role of depot antipsychotic medication?
Anti-stigma programs have exploded in the United States as well as across the world in the past decade. Now needed is a more strategic approach to stigma change, consideration of evaluation strategies that demonstrate its effectiveness.

Role of Memantine

World Health Organization (2012) C_WHO
Q2: For people with dementia, does memantine, when compared to placebo/comparator, produce benefits/harm in the specified outcomes in non-specialist health settings?
Q5: What is the added advantage of doing an electroencephalography (EEG) in people with convulsive epilepsy in non- specialist settings in low and middle income countries?
Q 7: For adults and children with convulsive epilepsy, which standard antiepileptic drugs (phenobarbital, phenytoin, carbamazepine, valproic acid) when compared to placebo/a comparator produce benefits/harm in the specified outcomes?
SCOPING QUESTION: For adults and children with medication-resistant convulsive epilepsy, which anti-epileptic medications produce benefits and/or harm in the specified outcomes when compared to a placebo or a comparator?

журнал психиатрия 1`2014

Гаврилова С.И, Aлесенко А.В., Mолочкина Е.М. et al. ФГБНУ «Научный центр психического здоровья» (2014) C2
Материалы научно-практической конференции с международным участием «Достижения в нейробиологии и терапии болезни Альцгеймера», посвященной памяти профессора Э. ... more
Q 12: In children and adolescents with anxiety disorders, what is the effectiveness and safety, considering system issues in low- and middle-income countries, of using pharmacological interventions in non-specialist settings?
Q7: What is the effectiveness, safety and role of pharmacological and non-pharmacological interventions, within non- specialist health care for children with a diagnosis of Attention-deficit hyperactivity disorder (ADHD)?

Community based rehabilitation (CBR)

World Health Organization (2012) C_WHO
Q4: Should community based rehabilitation be offered to children with intellectual disabilities?
Q15. SCOPING QUESTION: Is pharmacological intervention effective and safe for treatment of psychotic disorders in adolescents (including schizophrenia and bipolar disorder)?
Afr J Psychiatry 2011;14:200-207
Dialogues Clin Neurosci. 2017 Jun; 19(2): 93–107.
Q2: In individuals with psychotic disorders (including schizophrenia), is the use of two or more antipsychotic medications concurrently more effective and safer than the use of one antipsychotic only?
Q14. SCOPING QUESTION: In adults with psychotic disorders (including schizophrenia), what is the comparative effectiveness and safety of second-generation antipsychotic medications?
Supplement Article www.jaids.com J Acquir Immune Defic Syndr  Volume 78, Supplement 1, August 15, 2018
Accessed: 27.10.2019
Accessed: 27.11.2019
Médecins sans Frontières access campaign Issue Brief Accessed: 28.11.2019
Review www.co-hivandaids.com Volume 12 􏰀 Number 4 􏰀 July 2017
accessed Febr. 6, 2020

Expert Advisory Group on AIDS

GOV.UK developer docs; EAGA GOV.UK developer docs; EAGA (2014) C2
Providing expert scientific advice on HIV EAGA Secretariat
Accessed: 03.03.2020
Iran J Public Health, Vol. 45, No.11, Nov 2016, pp.1521-1522
Antimicrobial resistance(AMR) poses a serious threat to human, animal and environmental health. Implementing ethical practice guidelines on how to use antimicrobials effectively and responsibly within the pig industry will contribute in reducing and preventing antimicro ... more
The toolkit offers advice on how national public health authorities could engage with primary care prescribers so as to promote appropriate and responsible use of antibiotics. The toolkit contains template materials and some suggested key messages for health professionals, idea ... more
Improving the quality of hospital antibiotic use is a major goal of WHO’s global action plan to combat antimicrobial resistance. The WHO Essential Medicines List Access, Watch, and Reserve (AWaRe) classification could facilitate simple stewardship interventions that are widely applicable globally. ... more
Emerg Infect Dis. 2020 Jul [date cited]. https://doi.org/10.3201/eid2607.200915 Infection control instructions call for use of alcohol-based hand rub solutions to inactivate severe acute respiratory syndrome coronavirus 2. We determined the virucidal activity of World Health Organization–recommen ... more
A recent study informed that ivermectin was successfully used in vitro for the treatment of SARS-CoV-2 in experimentally infected cells and two preprint publications on observational clinical studies reported the apparent utility of ivermectin to treat patients with COVID-19 needing mechanical venti ... more
This statement aims to provide guidance and recommendation to African Union Member States in responding to the following questions: What should countries do when announcing identification of a herbal remedy or medicine? What are the implications for the rest of the continent?
Настоящий документ представляет собой руководство для государств-членов в Европейском регионе ВОЗ, которые желают провести исследования, направленные на выяснен ... more
10 December 2020
This document is part three in a series of explainers on vaccine development and distribution. Part one focused on how vaccines work to protect our bodies from disease-carrying germs. Part two focused on the ingredients in a vaccine and the three clinical trial phases. This document outlines the ... more
Available in English, French, Chinese, Arabic, Russian 8 February 2021
10 February 2021. Draft
21.12.2020 Available in English, Spanish, Italian and Portuguese
Vaccines 2021, 9(2), 160; https://doi.org/10.3390/vaccines9020160
African Union and the Africa Centers for Disease Control and Prevention’s Africa Regulatory Taskforce has endorsed the Emergency Used Authorization for Janssen COVID-19 Vaccine 10 March 2021
July 2021