1. Department of Medicine, Albert Einstein Medical Center, Philadelphia, PA 19141, USA
2. Department of Medicine, Bassett Medical Center and Columbia University College of Physicians and Surgeons, Cooperstown, NY 13326, USA
3. Division of Neurosurgery, Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
4. Division of Hospital Medicine, Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok 10330, Thailand