Table 3 Distribution of trial registrations

 Australian New Zealand Clinical Trials Registry (ANZCTR)

http://www.anzctr.org.au/

2

 Brazilian Clinical Trials Registry (ReBec)

http://www.ensaiosclinicos.gov.br/

0

 Chinese Clinical Trial Registry (ChiCTR)

http://www.chictr.org.cn/enIndex.aspx

2

 Clinical Research Information Service (CRiS), Republic of Korea

http://cris.nih.go.kr/cris/en/use_guide/cris_introduce.jsp

0

 Clinical Trials Registry - India (CTRI)

http://ctri.nic.in/Clinicaltrials/login.php

-^b

 Cuban Public Registry of Clinical Trials (RPCEC)

http://registroclinico.sld.cu/en/home

0

 German Clinical Trials Register (DRKS)

https://www.drks.de/drks_web/

-^b

 Iranian Registry of Clinical Trials (IRCT)

http://www.irct.ir/

1

 Japan Primary Registries Network (JPRN)

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

6

 Thai Clinical Trials Registry (TCTR)

http://www.clinicaltrials.in.th/

0

 The Netherlands National Trial Register (NTR)

http://www.trialregister.nl/trialreg/index.asp

0

 Sri Lanka Clinical Trials Registry (SLCTR)

https://slctr.lk/trials

0

 U.S. National Institutes of Health: USA only

https://clinicaltrials.gov/

63

 U.S. National Institutes of Health: International

https://clinicaltrials.gov/

107

 ISCTRP

http://apps.who.int/trialsearch

59

 Pan African Clinical Trial Registry (PACTR)

http://www.pactr.org/

0

 EU Clinical Trials Register (EU-CTR)

https://www.clinicaltrialsregister.eu/

9

 Total individual studies (excluding duplications)

249