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GM3 and GD3 contents at different mature milk lactation stages, i.e., 12–30 days, 1–2 months, 2–4 months, and 4–8 months postpartum are shown in total population (TP) and cities. * stands for significant difference (p < 0.05) at 4–8 months between Beijing and Suzhou for GM3, at 12–30 days between Beijing and Suzhou, and at 2–4 months and at 4–8 months between Guangzhou and Suzhou for GD3.
