Figure 1.
Sampling sites. SVN (red): 310 samples (Kien Giang: 223, Soc Trang: 21, Binh Duong: 7, Ho Chi Minh city: 59); CVN (green) 41 samples (Lam Dong: 26, Hue: 15); NVN (blue): 46 samples (Lao Cai: 15, Ha Giang: 31).
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