[1] Univ Washington, VA Puget Sound Hlth Care Syst, Seattle, WA 98108 USA
[2] Vrije Univ Amsterdam, Med Ctr, Amsterdam, Netherlands
[3] Nuffield Orthopaed Ctr, Oxford OX3 7LD, England
[4] Gustave Dron Hosp, Tourcoing, France
[5] IWGDF, Heemstede, Netherlands
[6] Univ Manitoba, Winnipeg, MB, Canada
[7] Univ Texas SW Med Ctr Dallas, Dallas, TX 75390 USA
[8] Parkland Hosp, Dallas, TX USA
[9] Univ Med Ctr, Ljubljana, Slovenia
[10] Nottingham Univ Hosp NHS Trust, Nottingham, England