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Change in serum osteocalcin, P1NP, and N-telopeptide levels during initial teriparatide (TPT) treatment (months 6–30), TPT withdrawal (months 30–42), and TPT re-treatment (months 42–54). Periods being compared (months 6–18 and 42–54) are denoted by the blue shading and red horizontal lines. Data are presented as mean ± se.
