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Choo J, Nam GE, Park J, Park CM, Lee SJ, Lee M, Kim J, Shin JH, Huh Y, Kim W, Kwon Y, Kim YH, Cho KH.  Associations of Physical Activity and Sitting Time with Serum Vitamin D Status in Korean Adults: Results from the 2014 Korea National Health and Nutrition Examination Survey.  Korean J Fam Pract 2020;10:123-128.  https://doi.org/10.21215/kjfp.2020.10.2.123