Effect of vitamin D in addition to letrozole on the ovulation rate of women with polycystic ovary syndrome: protocol of a multicentre randomised double-blind controlled trial por Ching-lung Cheung, Ernest H Y Ng, Shui Fan Lai, Jennifer K Y Ko, Sofie S F Yung, Rebecca S F Wan, Catherine K Y Wong, Keedon Wong, Raymond H W Li

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