1. Department of Molecular Medicine, Biochemistry Unit, University of Pavia, 27100 Pavia, Italy
2. Department of Genetics and Genome Biology, University of Leicester, Leicester LE1 7RH, United Kingdom
3. Department of Public Health and Experimental and Forensic Medicine, Unit of Biostatistics and Clinical Epidemiology, University of Pavia, 27100 Pavia, Italy
4. Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, 20892 Bethesda, MD, USA