1. Musculoskeletal Disease Center, Jerry L Pettis VA Medical Center, Loma Linda, CA 92357, USA
2. Department of Medicine, Loma Linda University, Loma Linda, CA 92354, USA
3. Institut de Recherches Cliniques de Montreal, Montreal, QC H2W 1R7, Canada
4. Département de Médecine, Université de Montréal, Montréal, QC H2W 1R7, Canada
5. Southern California Institute for Research and Education, Long Beach, CA 90822, USA