Guide Applied to a Study of a Diagnostic Test
Peter E. Alperin, MD, & Daniel J. Friedland, MD

The PIOPED Investigators: Value of the ventilation/perfusion scan in acute pulmonary embolism: Results of the Prospective Investigation of Pulmonary Embolism Diagnosis (PIOPED)

Guide Applied to a Study of an Intervention
Jeffrey A. Tice, MD, & Daniel J. Friedland, MD

Executive Committee for the Asymptomatic Carotid Atherosclerosis Study: Endarterectomy for asymptomatic carotid artery stenosis

Guide Applied to a Study of Prognosis
Philippe O. Szapary, MD, & Daniel J. Friedland, MD