Name	Type	Attributes	Definition
study_group_description	string	required, nullable	Designation of study arm to which the subject is assigned to
disease_diagnosis	:ref:`Ontology <OntoVoc>`	required, nullable	Diagnosis of subject
disease_length	string	required, nullable	Time duration between initial diagnosis and current intervention
disease_stage	string	required, nullable	Stage of disease at current intervention
prior_therapies	string	required, nullable	List of all relevant previous therapies applied to subject for treatment of `Diagnosis`
immunogen	string	required, nullable	Antigen, vaccine or drug applied to subject at this intervention
intervention	string	required, nullable	Description of intervention
medical_history	string	required, nullable	Medical history of subject that is relevant to assess the course of disease and/or treatment