論文（英文）
Volume-outcome relationship in rectal cancer surgery: a new perspective.
Yasunaga H, Matsuyama Y, Ohe K; Japan Surgical Society. Volume-outcome relationship in rectal cancer surgery: a new perspective. Surgery Today 2009; 39(8): 663-668.
Yasunaga H, Matsuyama Y, Ohe K; Japan Surgical Society. Volume-outcome relationship in rectal cancer surgery: a new perspective. Surgery Today 2009; 39(8): 663-668.