Prevalence of vitamin D deficiency in early-diagnosed cancer patients: A cross-sectional study by Almehmadi, Mazen, Alzahrani, Khalid, Salih, Magdi M., Alsharif, Abdulaziz, Alsiwiehri, Naif, Shafie, Alaa, Almalki, Abdulraheem A., Alhazmi, Ayman, Dahlawi, Haytham, Alharthi, Mohammed S., Halawi, Mustafa, Almehmadi, Abdulrhman M., Allam, Hatem H.

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