We are grateful to Dr. Danny Anthony Yonto, who helped revise the manuscript, and Weixia Li, who advised us on the statistical analysis. We thank Dr. Hein Mallee, Dr. Jianwei Du, Zhiwu Liao, and Dan Wang for their research support. We also thank our colleagues at the Center for Disease Control and Prevention in Baisha County, Baoting County, Changjiang County, Chengmai County, Dongfang City, Ledong County, Lingshui County, Qionghai City, Qiongzhong County, Sanya City, Tunchang County, Wanning City, and Wuzhishan City for their excellent data collection work.
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