1. Department of Anesthesia, The Permanente Medical Group, Oakland, California, USA.
2. Department of Anesthesia and Perioperative Care, University of California, San Francisco, California, USA.
3. Division of Research, Kaiser Permanente Northern California, Oakland, California, USA.
4. Department of Surgery, The Permanente Medical Group, Oakland, California, USA.
5. Department of Cardiology, and The Permanente Medical Group, Oakland, California, USA.
6. Department of Gastroenterology, The Permanente Medical Group, Oakland, California, USA.