Water Carcinogenicity and Prevalence of HPV Infection in Esophageal Cancer Patients in Huaihe River Basin, China

Table 2

The information of the sample point in the Huaihe River Basin of Shenqiu County, Henan province.

Sample type	Water volume (L)	Constant volume (mL)	Collected samples
River water	10	0.5	A tributary of the river
Shallow well water	10	0.3	About 10-meter depth
Deep well water	10	0.5	About 40-meter depth