Affiliation: | a Surgery Unit, San Rafael Hospital, Madrid, Spain b Cátedra de Cirugía, Facultad de Medicina, Universidad Complutense de Madrid, Pza. de Ramón y Cajal s.n., 28040 Madrid, Spain c Physiology Department (Animal Physiology II), Biological Sciences School, Complutense University of Madrid, Spain d Cellular Biology and Morphological Sciences Department, School of Medicine, Autonoma University of Madrid, Spain e Physiology Department, School of Veterinary, Autonoma University of Barcelona, Spain |