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International Clinical Trials Registry Platform (ICTRP) (World Health Organization)
Listing of Clinical Trial Registries (US Department of Health and Human Services)
ClinicalTrials.gov (United States National Library of Medicines)
Health Canada's Clinical Trials Database (Government of Canada)
European Union Clinical Trials Register (European Medicines Agency)
DRKS - German Clinical Trials Register
Netherlands Trial Register
The Coordination Office for Human Research (kofam) (Swiss Federal Office of Public Health)
The ISRCTN registry (United Kingdom)
Australian New Zealand Clinical Trials Registry (ANZCTR)
Chinese Clinical Trial Registry (ChiCTR)
Clinical Trials Registry (ICMR's National Institute of Medical Statistics) (India)
Iranian Registry of Clinical Trials (Iran University of Medical Sciences - IUMS)
Clinical Trials Registry (The Japan Medical Association Center for Clinical Trials)
The Clinical Research Information Service (CRIS) (Korea Centers for Disease Control and Prevention)
Philippine Health Research Registry (not open access)
Thai Clinical Trials Registry (Medical Research Network)
Brazilian Clinical Trials Registry
Cuban Registry of Clinical Trials (RPCEC)
The Peruvian Clinical Trial Registry – REPEC (Instituto Nacional de Salud)
Pan African Clinical Trials Registry (PACTR) (Cochrane South Africa at the South African Medical Research Council)
The South African National Clinical Trials Register (SANCTR) (South Africa Department of Health)
Tanzania Clinical Trials Registry (TzCTR) (Tanzania Food and Drugs Authority)
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