Dyadic Effects of Individual and Friend on Physical Activity in College Students - Chung Yul Lee; Eunhee Cho; Tae Hwa Lee; In-Sook Kim; Gwang Suk Kim; Hyeonkyeong Lee; Suhee Kim; Linda L. McCreary; In Sook Kim; Su Hee Kim; Kim, Gwang Suk; Kim, Su Hee; et al. (Public Health Nursing, 2015)