[1] Hosp St Anna, Dept Pediat, ASST Lariana, Como, Italy
[2] Univ Insubria, Hosp F Del Ponte, Woman & Child Dept, Varese, Italy
[3] S Gerardo Hosp, MBBM Fdn, Clin Pediat Genet Unit, Monza, Italy
[4] Azienda Rilievo Nazl ARNAS Garibaldi, Pediat Unit, Catania, Italy
[5] San Paolo Hosp, Dept Pediat, Milan, Italy
[6] SS Annunziata Hosp, Screening Ctr Fenilchetonuria, ASL Na1, Naples, Italy
[7] Sapienza Univ Rome Hosp Latina, Dept Pediat, Rome, Italy
[8] Osped Infantile Regina Margherita, Emergency Dept, Turin, Italy
[9] Bambino Gesu Children Hosp & Res Inst, Metab Dis Unit, Rome, Italy
[10] San Martino Hosp, Pediat Unit, Belluno, Italy
[11] Catholic Univ, Fdn Policlin Univ A Gemelli, Ctr Rare Dis & Congenital Defects, Rome, Italy
[12] Univ Florence, Dept Expt & Clin Biomed Sci, Florence, Italy
[13] Meyer Childrens Hosp, Newborn Screening Clin Chem & Pharmacol Lab, Florence, Italy
[14] Bambino Gesu Pediat Hosp, IRCCS, Pediat & Infect Dis Unit, Rome, Italy
[15] Policlin Hosp, Clin Pediat & Neonatol Unit, Woman & Child Dept, Palermo, Italy