Indian clinical trial registry identifier https://www.who.int/ictrp/network/primary/en/ CRTI identifier http://ctri.nic.in/Clinicaltrials/login.php A centrally registered identifier that is assigned for a specific clinical trial registered in the Indian clinical trial register. The format for the registry number is “CRTI/” followed by a 4-digit number, followed by a slash, followed a 2-digit number, followed by a slash, followed a 6-digit number, e.g., CTRI/2020/03/024402. Clinical Trials Registry - India identifier Clinical Trial Registry Identifier