論文（英文）
Effects of hospital and surgeon volumes on operating times, postoperative complications, and length of stay following laparoscopic colectomy.
Yasunaga H, Matsuyama Y, Ohe K; Japan Surgical Society. Effects of hospital and surgeon volumes on operating times, postoperative complications, and length of stay following laparoscopic colectomy. Surgery Today 2009; 39(11): 955-961.