One author replies.
Department of Epidemiology, School of Public Health, Wuhan University, Wuhan, China.
Zhi-Jiang
ZJ
Zhang
D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy*; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use*; D008175:Lung Neoplasms / Q000453:epidemiology*; D008687:Metformin / Q000627:therapeutic use*
D007004:Hypoglycemic Agents; D008687:Metformin