Pharmacokinetics of 0.75 % ropivacaine and 0.5 % bupivacaine after ilioinguinal-iliohypogastric nerve block in children. - Ala-Kokko,T.I.; Karinen,J.; Raiha,E.; Kiviluoma,K.; Alahuhta,S. (Br J Anaesth, 2002)