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M‐value. M‐value after 3 months of melatonin treatment and 3 months of placebo treatment. Two black circles connected by the same black line represent a participant who is a homozygous carrier of the rs10830963 wild‐type allele. Two red circles connected by the same red line represent a participant who is an rs10830963 risk‐allele carrier. The blue circles connected by the blue dashed line represent the geometric means of all 17 participants. *p, 0.016.
