title: Walking the line.
authors.affiliation: Canadian Cardiovascular Society.
authors.forename: David
authors.initials: D
authors.lastname: Johnstone
mesh_terms: D002170:Canada; D002309:Cardiology / Q000592:standards*; D003406:Credentialing / Q000458:organization & administration*; D012955:Societies, Medical / Q000592:standards*