1. The Four Ps: Place, Procedure, Personnel, and Patient
Jeffrey L. Apfelbaum, MD 
Anesthesiology Clinics 
Volume 32, Issue 2, Pages xvii-xxi (June 2014)
DOI: /j.anclin
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2. Fig. 1
Patient, providers, procedure, and place all overlap: proceed. CST, certified surgical technician; MD, medical doctor; OR operating room; PACU, postanesthesia care unit; RN, registered nurse.
Anesthesiology Clinics  , xvii-xxiDOI: ( /j.anclin )
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3. Fig. 2
Patient, providers, procedure, and place do not all overlap: do not proceed.
Anesthesiology Clinics  , xvii-xxiDOI: ( /j.anclin )
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4. Jeffrey L. Apfelbaum, MD, Editor
Anesthesiology Clinics  , xvii-xxiDOI: ( /j.anclin )
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5. Thomas W. Cutter, MD, MAEd, Editor
Anesthesiology Clinics  , xvii-xxiDOI: ( /j.anclin )
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