Caudal additives to ropivacaine in children: preservative free S-ketamine versus clonidine
De Negri P
Department of Anaesthesia and Intensive Care H 'Casa Sollievo della Sofferenza' IRCCS, S. Giovanni R, Italy; Children's Hospital 'Regina Margherita', Turin, Italy.
Visconti
C
Ivani
G
Borrelli
F
De Vivo P