Global Code Book Ontology	WHO COVID-19 Rapid Version CRF semantic data model	Source
http://purl.obolibrary.org/obo/NCIT_C2998	http://purl.obolibrary.org/obo/SYMP_0019153	LOOM
http://purl.obolibrary.org/obo/NCIT_C34661	http://purl.obolibrary.org/obo/HP_0002315	LOOM
http://purl.org/vodan/whocovid19crfsemdatamodel/Headache	http://purl.obolibrary.org/obo/HP_0002315	LOOM