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Flow diagram of literature search and research selection procedure. N, number of comparisons; (), number of trials; s, serum; u, urine; ALP, total alkaline phosphatase; BAP, bone alkaline phosphatase; CTX, C-terminal telopeptides of type 1 collagen; DPD, deoxypyridinoline; NTX, N-terminal telopeptide of type 1 collagen; OC, osteocalcin; PICP, C-terminal propeptides of type 1 collagen; PINP, N-terminal propeptides of type 1 collagen; PYD, pyridinoline.
