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Khakshour, A. and Farhat, A. S. and Mohammadzadeh, A. and Zadeh, F. K. and Zhila, Sheikh and Kamali, H. (2015) The association between 25-dehydroxy vitamin D and lower respiratory infection in children aged less than “5” years in ImamReza hospital, Bojnurd, Iran. Journal of the Pakistan Medical Association, 65 (11). pp. 1153-1155.