1. University of Michigan, Ann Arbor, MI, USA
2. Nassau University Medical Center, East Meadow, NY, USA
3. University of Medicine and Dentistry of NJ–Robert Wood Johnson University Hospital, New Brunswick, NJ, USA
4. St. Barnabas Medical Center, Livingston, NJ, USA
5. Weill Medical Center, Cornell University, New York, NY, USA
6. Hospital for Special Surgery, New York, NY, USA