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

Reino Unido(ISRCTN). http://www.isrctn.com/

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.https://rctportal.niph.go.jp/en/

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

Clinical Research Information Service (CRiS), Republic of Korea.https://cris.nih.go.kr/cris/en/use_guide/cris_introduce.jsp

Clinical Trials Registry - India (CTRI).http://ctri.nic.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).https://www.slctr.lk/

Iranian Registry of Clinical Trials (IRCT).http://www.irct.ir/

Thai Clinical Trial Registry (TCTR).http://www.clinicaltrials.in.th/

Peruvian Clinical Trial Registry (REPEC).http://https://ensayosclinicos-repec.ins.gob.pe/en/

Lebanese Clinical Trials Registry (LBCTR).https://lbctr.moph.gov.lb/