L. Brian Ready, Rollin Oden, H. S. Chadwick, Costantino Benedetti, G. Alec Rooke, Robert Caplan, Lorie M. Wild,
Development of an Anesthesiology-based Postoperative Pain Management Service Anesthesiology. ,vol. 68, pp. 100- 106 ,(1988) ,
10.1097/00000542-198801000-00016