Correction to: Scientific Reports https://doi.org/10.1038/s41598-018-23251-3, published online 20 March 2018

This Article contains errors in the Introduction section.

“This survey was administered in Yanting County of Guizhou Province, which is a high-incidence area for EC, and in Qingzhen City, which is a low-incidence area. Yanting, a rural and one the most indigent counties in Sichuan Province, is located northeast of Chengdu City, at 105° latitude N and 31° longitude E.”

should read:

“This survey was administered in Yanting County of Sichuan Province, which is a high-incidence area for EC, and in Qingzhen City of Guizhou Province, which is a low-incidence area. Yanting, a rural and one the most indigent counties in Sichuan Province, is located northeast of Chengdu City, at 31° latitude N and 105° longitude E.”