1. Department of Medicine, College of Physicians and Surgeons, Columbia University, and the Medical Service of the Presbyterian Hospital, New York, New York.
2. Assistant Professor of Medicine, Columbia University College of Physicians and Surgeons.
3. Fellow in Medicine, Columbia University College of Physicians and Surgeons.
4. Research Assistant, Columbia University College of Physicians and Surgeons.
5. Professor of Medicine, Columbia University College of Physicians and Surgeons.