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Factors involved in the pathogenesis of osteoporosis and chemical structures of vitamin D2/D3. A Factors contributing to pathogenesis of osteoporosis. Osteoporosis can be affected by multiple factors, such as gender, age, race, body size, family history, diet, changes in hormones, lifestyle, and special medicines. B Chemical structures of vitamin D2 (C28H44O) and D3 (C27H44O) are shown
