Tadjalli-mehr, Keyvan, Nikolaus Becker, Mati Rahu, Aivars Stengrevics, Juozas Kurtinaitis, and Matti Hakama. 2003. “Randomized Trial With Fruits and Vegetables in Prevention of Cancer”. Acta Oncologica 42 (4):287-93. https://doi.org/10.1080/02841860310011852.