Department of Epidemiology and Public Health;
School of Medicine;
Yokohama City University;
Yokohama;
Japan;
Department of Hygiene and Preventive Medicine;
School of Medicine;
Fukushima Medical University;
Fukushima;
Japan;
Division of Environmental and Preventive Medicine;
Department of Social Medicine;
Faculty of Medicine;
Tottori University;
Yonago;
Japan;
HPLC/UV; Column-Switching; Method; Nicotine; Hair; Cotinine;