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T.C. Tso
Tobacco Laboratory, Beltroille Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland, U.S.A.
J. F. Chaplin
Tobacco Station, Agricultural Research Service, U.S. Department of Agriculture, Oxford, North Carolina, U.S.A.
J. D. Adams
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.