1. Microbiology Department, Hospital Comarcal Valdeorras, Avenida Conde de Fenosa, No. 50, CP 32300, O Barco, Ourense, Spain
2. Pediatrics Department, Hospital Comarcal Valdeorras, Avenida Conde de Fenosa, No. 50, CP 32300, O Barco, Ourense, Spain
3. Immunology Department, Hospital Universitario Ramón y Cajal, Ctra Colmenar Viejo, Km 9,100, CP 28034, Madrid, Spain