title: Letter by Ong et al regarding article, "coronary artery spasm: a 2009 update".
authors.forename: Peter
authors.initials: P
authors.lastname: Ong
authors.forename: Anastasios
authors.initials: A
authors.lastname: Athanasiadis
authors.forename: Udo
authors.initials: U
authors.lastname: Sechtem
mesh_terms: D000787:Angina Pectoris / Q000175:diagnosis* / Q000209:etiology*; D017023:Coronary Angiography; D003329:Coronary Vasospasm / Q000175:diagnosis* / Q000209:etiology*; D004562:Electrocardiography; D006801:Humans