[1] CSIC, Dept Microbiol & Biochem, Inst Prod Lacteos Asturias, Villaviciosa 33300, Asturias, Spain
[2] Univ Nacl Litoral, Fac Chem Engn, Inst Lactol Ind UNL CONICET, Santa Fe, Argentina
[3] Hosp Cabuenes, Paediat Serv, SESPA, Gijon, Asturias, Spain
[4] Hosp Univ Cent Asturias, Paediat Serv, SESPA, Oviedo, Asturias, Spain