Methods: This was a prospective randomized study.

方法：随机的前瞻性研究。

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Patients and METHODS: This was a prospective, randomized, crossover study of 42 patients with longstanding ulcerative colitis.

病人与方法：本研究为前瞻性随机交叉试验研究。42例长期溃疡性结肠炎患者纳入。

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Methods: It's a prospective randomized control study.

方法：采用前瞻性随机对照临床研究方法。

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