title: Response to letter in regard to Lorente et al, "Serum melatonin levels are associated with mortality in severe septic patients".
authors.affiliation: Intensive Care Unit, Hospital Universitario de Canarias, Ofra, s/n. La Laguna, 38320, Santa Cruz de Tenerife, Spain. Electronic address: lorentemartin@msn.com.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Lorente
authors.affiliation: Intensive Care Unit, Hospital Universitario Nuestra Señora Candelaria, Crta Rosario s/n. Santa Cruz Tenerife, 38010, Spain. Electronic address: mar.martinvelasco@gmail.com.
authors.forename: María M
authors.initials: MM
authors.lastname: Martín
authors.affiliation: Deparment of Phisiology, Faculty of Medicine, University of the La Laguna, Ofra, s/n. La Laguna, 38320, Santa Cruz de Tenerife, Spain. Electronic address: pabreu@ull.es.
authors.forename: Pedro
authors.initials: P
authors.lastname: Abreu-González