Study protocol for a nationwide questionnaire survey of physical activity among breast cancer survivors in Japan
Yoichi Shimizu, Katsunori Tsuji, Eisuke Ochi, Hirokazu Arai, Ryo Okubo, Aya Kuchiba, Taichi Shimazu, Naomi Sakurai, Tomomi Narisawa, Taro Ueno, Hiroji Iwata, Yutaka Matsuoka
BMJ Open Jan 2020, 10 (1) e032871; DOI: 10.1136/bmjopen-2019-032871