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

Figure 4

HPLC-MS of 3-MC in Huaihe River Basin water samples. (a) River water; (b) well water from 10-meter depth; and (c) well water from 40-meter depth.

(a)

(b)

(c)