[1] Hlth Inst Carlos III, Natl Ctr Microbiol, Enterovirus Unit, Madrid, Spain
[2] Hosp Negrin de Gran Canaria, Las Palmas Gran Canaria, Spain
[3] Hosp Severo Ochoa, Dept Pediat, Madrid 28911, Spain
[4] Hosp Burgos, Burgos, Spain
[5] Hosp San Joan de Deu, Barcelona, Spain
[6] Hosp Virgen Arrixaca, Murcia, Spain
[7] Hosp Ourense, Orense, Spain
[8] Hosp Santa Creu & Sant Pau, Barcelona, Spain
[9] Hosp Miguel Servet, Zaragoza, Spain
[10] Hosp La Paz, Madrid, Spain
[11] Hosp Virgen de las Nieves, Granada, Spain