Comment on

• Diagnosing syncope. Part 2: Unexplained syncope. Clinical Efficacy Assessment Project of the American College of Physicians.

  Linzer M, Yang EH, Estes NA 3rd, Wang P, Vorperian VR, Kapoor WN. Linzer M, et al. Ann Intern Med. 1997 Jul 1;127(1):76-86. doi: 10.7326/0003-4819-127-1-199707010-00014. Ann Intern Med. 1997. PMID: 9214258 Review.