患者,女,20岁。腹痛伴便秘6个月,便无脓血,腹痛症状于排便后减轻,体重无下降。体格检查未见异常。粪便化验阴性。最可能的诊断为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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