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Figure 1: Study fl ow diagram [OA = Osteoarthritis, 25(OH)D = 25-hydroxyvitamin D]
![Figure 1: Study fl ow diagram [OA = Osteoarthritis, 25(OH)D = 25-hydroxyvitamin D]](articles/2016/8/1/images/NorthAmJMedSci_2016_8_1_47_175216_u7.jpg)