Blood lead levels in relation to smoking and chronic obstructive pulmonary disease (COPD): a study from Korean National Health and Nutrition Examination Survey (KNHANES)

Eunyoung Lee, Bumhee Park, Woo Young Chung, Ji Eun Park, Sung Chul Hwang, Kwang Joo Park, Seung Soo Sheen, Song Vogue Ahn, Jae Bum Park, Chul Min Ahn, Sang Haak Lee, Jae Yeol Kim, Eun Mi Chun, Young Sik Park, Kwang Ha Yoo, Hyoung Kyu Yoon, Joo Hun Park, Korean Smoking Cessation Study Group