title: Answer to letter: Factors that can alter the melatonin circadian rhythm, by Yvan Touitou, Michael H. Smolensky and Alain Reinberg.
authors.affiliation: College of Interfaculty Individual Studies of Mathematics and Natural Sciences, University of Warsaw, Warsaw, Poland.|Faculty of Geography and Regional Studies, University of Warsaw, Warsaw, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Wieczorek
authors.affiliation: Faculty of Geography and Regional Studies, University of Warsaw, Warsaw, Poland.|Polish Academy of Sciences, Institute of Geography and Spatial Organization, Warsaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Blazejczyk
authors.affiliation: Department of Environmental Science, Fukuoka Women's University, Fukuoka, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Morita