COL1A2 and osteogenesis imperfecta: The majority of causative-OI mutations identified were in the COL1A1gene, representing 47% (14/30) of all variants detected in this study, followed by30% (9/30) in the COL1A2 gene, 10% (3/30) in theFKBP10 gene, 7% in the P3H1 gene (2/30), and3% (1/30) in the IFITM5 gene.