The efficacy of ropivacaine-fentanyl versus ropivacaine-clonidine for pre-emptive caudal anesthesia in children - Khatavkar, Sonal S.; Lonkar, Sarika S.; Panchal, Pournima B.; Thatte, W. S.; Nagendra, Sai; Tewari, Divya (Anaesthesia, Pain & Intensive Care, 2019)