1. Skeletal Diseases and Mineral Homeostasis Section; National Institute of Dental and Craniofacial Research; National Institutes of Health; Bethesda MD USA
2. Department of Endocrinology; School of Medicine; Pontificia Universidad Catolica de Chile; Santiago Chile
3. Rehabilitation Medicine Department; Mark O. Hatfield Clinical Research Center; National Institutes of Health; Bethesda MD USA
4. Biomedical Computer Research Institute; Philadelphia; PA USA