The 20 items to be submitted when registering a clinical trial will be:

• Name of primary register, and unique ID number assigned by the primary register to this trial.
• Date of registration in primary register
• Secondary ID: other identifying numbers and issuing authorities.
• Source(s) of monetary or material support.
• Primary sponsor: individual, organization, group or other legal person responsible for the trial.
• Secondary sponsor(s).
• Contact for public queries.
• Contact for scientific queries.
• Public title: intended for lay public in easily understood language.
• Scientific title of the study, as it appears in the protocol.
• Countries of recruitment.
• Health condition(s) or problem(s) studied.
• Intervention(s).
• Key inclusion and exclusion criteria for participant selection, including age and sex.
• Study type: for example, single arm or randomized trial.
• Date of enrolment of first participant, anticipated or actual.
• Target sample size: number of participants that trial plans to enrol.
• Recruitment status of this trial. Pending: participants are not yet being recruited or enrolled at any site. Active: participants are currently being recruited and enrolled Temporary halt: there is a temporary halt in recruitment and enrolment. Closed: participants are no longer being recruited or enrolled.
• Primary outcome(s).
• Key secondary outcomes.

For full details see: www.who.int/ictrp/data_set/en/index.html