And the DNA test accurately showed negative results in all 70 healthy patients they tested, Dr.David Ahlquist of the Mayo Clinic in Minnesota told the Digestive Disease Week meeting in Chicago.

• 明尼苏达州梅奥诊所的DavidAhlquist医生在芝加哥的消化系统疾病会议上说：他们对70个正常人进行DNA检测，结果全是阴性。