[1] UNIV SO CALIF, ORTHOPAED HOSP, BONE & CONNECT TISSUE RES LABS, LOS ANGELES, CA 90007 USA
[2] NICHOLS INST, ENDOCRINE REFERENCE LAB, SAN JUAN CAPISTRANO, CA 92675 USA
[3] NATL ANIM DIS LAB, AMES, IA 50010 USA
[4] UNIV PENN, SCH MED, DEPT MED, PHILADELPHIA, PA 19104 USA