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• ClinicalTrials.gov - ClinicalTrials.gov provides regularly updated information about federally and privately supported clinical research in human volunteers.

• ClinicalStudyResults.org - This is a central, widely accessible, web-based repository for clinical study results in a reader-friendly, standardized format and is designed as a key tool to provide information to practicing physicians and their patients.

• Current Controlled Trials - This site allows users to search, register and share information about randomised controlled trials.

• National Cancer Institute - This site provides an exhaustive search of NCI's clinical trials and its results topic-wise. It also assists the readers with useful information about noteworthy clinical trials and provides educational materials about them.

• WHO International Clinical Trials Registry Platform (ICTRP) - This Search Portal is a web site that enables users to search a central database that contains the trial registration data sets provided by Primary Registers.

• Eli Lilly & Company Clinical Trial Registry - This site contains information about clinical trials sponsored by Eli Lilly & Company. It reports results only from individual studies.

• GlaxoSmithKline Clinical Trial Register - It provides an easily accessible repository of data from GSK-sponsored clinical trials, supplementing communications in journals, at scientific meetings, in letters to healthcare professionals and in approved prescribing information.

• Merck-Sponsored Clinical Trials - It furnishes balanced, complete, & accurate information regarding its hypothesis-testing clinical studies, regardless of trial outcome.