COL1A2 and osteogenesis imperfecta: Although it has been suspected to be associated with a COL1A1 mutation [18] and to predominantly occur in the milder OI types [1,19], no association has been demonstrated between the presence and type of hearing loss, and the OI subtype, the mutated gene or mutation type in a Finnish population of 47 unrelated OI patients with identified mutations in COL1A1 or COL1A2[20].