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S. S. Hecht
Naylor Dana Institute for Disease Prevention, American Health Foundation, Valhalla, New York, U.S.A.
C. B. Chen
Naylor Dana Institute for Disease Prevention, American Health Foundation, Valhalla, New York, U.S.A.
M. Dong
Naylor Dana Institute for Disease Prevention, American Health Foundation, Valhalla, New York, U.S.A.
R. M. Ornaf
Naylor Dana Institute for Disease Prevention, American Health Foundation, Valhalla, New York, U.S.A.
D. Hoffmann
Naylor Dana Institute for Disease Prevention, American Health Foundation, Valhalla, New York, U.S.A.
T. C. Tso
Tobacco Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, Md., U.S.A.