1. Costs of anesthesia;Johnstone;Anesth Analg,1993
2. Criteria for selection of ambulatory surgery patients and guidelines for anesthetic management: a retrospective study of 1553 cases;Meridy;Anesth Analg,1982
3. Unanticipated admission to the hospital following ambulatory surgery;Gold;JAMA,1989
4. Factors influencing spinal anesthesia;Lambert;Int Anesthesiol Clin,1989
5. Challenges and opportunities: the future in regional anesthesia;Greene;Reg Anesth,1987