Sulphatoxymelatonin, among night healthcare workers: differences between more and less tolerant to night work - Borges, Flávio Notarnicola da Silva; Fischer, Frida Marina; Moreno, Claudia Roberta de Castro; Benedito-Silva, Ana Amélia; Pires, M. L. N.; Rotenberg, L; Soares, N. S.; Fonseca, M B; Smolensky, M; Sackett-Lundeen, L; Haus, Erhard (International Congress of Applied Chronobiology and Chronomedicine, 2007)