1 Freeman R. Syncope. In: Jameson J, Fauci AS, Kasper DL, Hauser SL, Longo DL, Loscalzo J. eds. Harrison’s Principles of Internal Medicine, 20e New York, NY: McGraw-Hill; Accessed December 2018.

2. nnals of Emerg Med: Quinn J et. al. Prospective Validation of the San Francisco Syncope Rule to Predict Patients with Serious Outcomes. Ann Emerg Med 2006;47: 448-454