Prospective study of the association between grapefruit intake and risk of breast cancer in the European Prospective Investigation into Cancer and Nutrition (EPIC) - Elizabeth A. Spencer; Timothy J. Key; Paul N. Appleby; Carla H. van Gils; Anja Olsen; Anne Tjønneland; Françoise Clavel-Chapelon; Marie-Christine Boutron-Ruault; Marina Touillaud; Maria-José Sánchez; Sheila Bingham; Kay Tee Khaw; et al. (Cancer Causes & Control, 2009)