[1] RES LAB CALCIUM METAB,DEPT ORTHOPED SURG,CH-8008 ZURICH,SWITZERLAND
[2] RES LAB CALCIUM METAB,DEPT MED,CH-8008 ZURICH,SWITZERLAND
[3] ROWETT RES INST,BUCKSBURN AB2 9SB,ABERDEEN,SCOTLAND
[4] HARVARD UNIV,MASSACHUSETTS GEN HOSP,SCH MED,DEPT MED,BOSTON,MA 02114