[1] Stanford Univ, Med Ctr, Palo Alto, CA 94304 USA
[2] Sanofi Genzyme, Bridgewater, NJ USA
[3] Regeneron Pharmaceut Inc, 777 Old Saw Mill River Rd, Tarrytown, NY 10591 USA
[4] Complejo Hosp Univ Santiago de Compostela, Santiago, Spain
[5] Buenos Aires Univ, Sch Med, Buenos Aires, DF, Argentina
[6] Riesgo Fractura SA CAYRE, Bogota, Colombia
[7] Leiden Univ, Med Ctr, Leiden, Netherlands
[8] Charite Univ Med Berlin, Berlin, Germany