has role has_role has role Homo sapiens Homo sapiens contact person https://prsinfo.clinicaltrials.gov/definitions.html#StudyOfficials A person who serves as a contact role and has disclosed specified information to be reached. Usually the contact information, such as email and phone number, is provided., Leon Li, Asiyah Lin, Oliver He In clinicaltrials.gov, contact information character limits: First Name: 62 characters Last Name: 62 characters Degree: 30 characters Phone: 30 characters Phone Ext: 14 characters Email: 254 characters Citation: https://prsinfo.clinicaltrials.gov/definitions.html#StudyOfficials Leon, Asiyah, Oliver: Since each contact needs to provide some contact information, we may need to define the contact information. contact person role