Physical activity and cancer: an umbrella review of the literature including 22 major anatomical sites and 770 000 cancer cases - Rezende, Leandro Fornias Machado de; Sa, Thiago Herick de; Markozannes, Georgios; Rey-Lopez, Juan Pablo; Lee, I-Min; Tsilidis, Konstantinos K.; Ioannidis, John P. A.; Eluf-neto, Jose (British journal of sports medicine, 2018)