The EPIC-Norfolk Study
Plasma carotenoid levels in relation to tobacco smoking and demographic factors.
Lagiou P, Benetou V, Tebelis N, Papas A, Naska A, and Trichopoulou A
International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition. Jul 2003
(DOI : 10.1024/0300-9831.73.3.226)