1. Dipartimento di Fisiopatologia, Medicina Sperimentale e Sanità Pubblica, University of Siena, Via A. Moro 3, 53100-Siena, Italy
2. Department of Medical Chemistry, Semmelweis University, 1444-Budapest, Hungary
3. Division of Maternal and Child Health Sciences, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, U.K.