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Clinicaltrials.gov (U.S.A National Library of Medicine).http://clinicaltrials.gov

ISRCTN. International Standard Randomized Controlled Trial Number Register. http://www.controlled-trials.com/isrctn/

Brazilian Clinical Trials Registry (ReBec).http://www.ensaiosclinicos.gov.br/

Australian New Zealand Clinical Trials Registry (ANZCTR).http://www.anzctr.org.au/

The Netherlands National Trial Register (NTR). http://www.trialregister.nl

UMIN Clinical Trials Register-Japón.http://www.umin.ac.jp/ctr/

Chinese Clinical Trial Registry (ChiCTR).http://www.chictr.org/

Clinical Research Information Service (CRiS), Republic of Korea.http://ncrc.cdc.go.kr/cris/index.jsp

Clinical Trials Registry - India (CTRI).http://www.ctri.in/

EU Clinical Trials Register (EU-CTR).https://www.clinicaltrialsregister.eu/

German Clinical Trials Register (DRKS).http://www.germanctr.de/

Pan African Clinical Trial Registry (PACTR).http://www.pactr.org/

Sri Lanka Clinical Trials Registry (SLCTR).http://www.slctr.lk/