Bernstein P S, Johnson E J, Neuringer M, Schalch W, Schierle J
Ophthalmology and Visual Sciences, Moran Eye Center, University of Utah School of Medicine, Salt Lake City, UT, USA.
Carotenoids and Nutrition Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA.
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