Clinical trial registration falls within the scope of research and publication ethics. Any study submitted for publication in an international peer-reviewed journal that does not meet this standard may be rejected immediately during the review process. Some authors are not aware of the need for clinical trial registration and do not know how to register their clinical trials. Unfortunately, reports of some excellent clinical trials are rejected for publication, because they do not meet the criteria for clinical trial registration. Some registration websites are listed below for reference:

Clinical trial registration websites:
USA: www.clinicaltrials.gov
China: www.chictr.org.cn/enIndex.aspx
World Health Organization - International Clinical Trials Registry 

Platform: www.who.int/ictrp/en/