On p. 812 of the September issue, Junko Yasufuku-Takano, a coauthor who greatly contributed to the study reported in the letter entitled “Estrogenic impurities in labware”, was omitted from the list of authors. Her name should have been printed between “Koji Takano” and “Toshiro Fujita”. In the same letter, Table 1 also contains an error. CellStar is a brand manufactured by Greiner, not Corning.