Baek, Jiwon; Baldina, Ekaterina; Sung, Kiho; Lee, Sung-Ha; Christakis, Nicholas A.; Bearman, Peter; Kim, Hyeon Chang; Chu, Sang Hui; Lee, Eun; Park, Yeong-Ran; Chey, Jeanyung; Choi, Youn-Hee; Lee, Dohoon; Youm, Yoosik
American Journal of Epidemiology, Vol.193 No.2, pp.241-255