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1 The relationship between serum vitamin D levels and sleep quality in fixed day indoor field workers in the electronics manufacturing industry in Korea
Young Saeng Jung, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Ho Sung Kwak
Ann Occup Environ Med.2017;29(1):25.  Published online 2017 June 24     DOI: http://dx.doi.org/10.1186/s40557-017-0187-7
      

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