Table 1.

List of international and national databases of clinical trials used for this systematic review

Databases	URL internet
ClinicalTrials.gov	https://clinicaltrials.gov
EU Clinical Trials Register	https://www.clinicaltrialsregister.eu
Australian New Zealand Clinical Trials Registry	https://www.australianclinicaltrials.gov.au
Japan Primary Registries Network	http://www.umin.ac.jp/ctr/
International Standard Randomised Controlled Trial Number	https://www.isrctn.com
Chinese Clinical Trial Registry	http://www.chictr.org.cn
Cuban Public Registry of Clinical	http://registroclinico.sld.cu
Peruvian Clinical Trials Registry	http://www.ensayosclinicos-repec.ins.gob.pe
Clinical Trials Registry-India	http://ctri.nic.in
German Clinical Trials Register	https://www.drks.de
The Netherlands National Trial Register	http://www.trialregister.nl
Brazilian Clinical Trials Registry (ReBec)	http://www.ensaiosclinicos.gov.br
Clinical Research Information Service-Republic of Korea	https://cris.nih.go.kr
Pan african Clinical Trial Registry	http://www.pactr.org
Sri Lanka Clinical Trials Registry	http://slctr.lk
Thai Clinical Trials Register	http://www.clinicaltrials.in.th
Iranian Registry of Clinical Trials	http://www.irct.ir