1. Pennsylvania State University College of Medicine, State College, Pennsylvania, USA.
2. Oakland University William Beaumont School of Medicine, Rochester, Michigan, USA.
3. Department of Medicine, NYU School of Medicine, New York, New York, USA.
4. Department of Pediatrics, Louisiana State University School of Medicine, New Orleans, Louisiana, USA.
5. Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas, USA.