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children infant study morphine surgery patient group response score postoperative neonate value effect activity index analgesia action acetaminophen concentration period anesthesia procedure system paracetamol expression difference scale analysis chapter wake-up test assessment pain relief month relief hospital infusion comfort control measure indicator postoperative pain hospital experiences plasma result immunisation table administration diclofenac circumcision number vas scores experience anaesthesia sensitivity wake-up measurement pain assessment mouth stretch stress child adult muscle mg.kg change morphine infusion efficacy postoperative pain relief parameter trial rectal pain responses comparison caudal immunization mouth michigan sedation scale motor parameters heart increase heart rate