1. Johnson & Johnson Pharmaceutical Research and Development; Pharmacoepidemiology; PO BOX 200, M/S K304 Titussville NJ USA 08560
2. Tufts Medical Center; Department of Anesthesiology; 800 Washington street Boston Massachusetts USA 02111
3. University of California, San Francisco; Family and Community Medicine; Family Health Center 995 Potrero Avenue, Ward 83 San Francisco California USA 94110
4. Lahey Clinic; Department of Surgical Critical Care; 41 Mall Road Burlington Massachusetts USA 01805