[1] St Josef Hosp Essen Werden, Dept Orthoped & Trauma Surg, Propsteistr 2, D-45239 Essen, Germany
[2] Seattle Sci Fdn, 550 17th Ave,Suite 600, Seattle, WA 98122 USA
[3] Ruhr Univ Bochum, BG Univ Hosp Bergmannsheil, Dept Orthoped & Trauma Surg, Burkle de la Camp Pl 1, D-44789 Bochum, Germany
[4] Univ Hosp Essen, Dept Trauma Hand & Reconstruct Surg, Hufelandstr 55, D-45147 Essen, Germany