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Relationships among serum leptin concentrations and serum thyroxine, insulin, prolactin and estradiol concentrations in lactating women during days 1–3 or 15–180 postpartum. Serum leptin concentrations were plotted against serum thyroxine, insulin, prolactin and estradiol concentrations in venous blood samples collected from breastfeeding women at days 1–3 (white circle) and 15–180 (black circle) postpartum.
