机构:
Univ London Imperial Coll Sci Technol & Med, Gastroenterol Sect, Fac Med, London W12 0NN, EnglandUniv London Imperial Coll Sci Technol & Med, Gastroenterol Sect, Fac Med, London W12 0NN, England
Walters, JRF
van Heel, DA
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机构:
Univ London Imperial Coll Sci Technol & Med, Gastroenterol Sect, Fac Med, London W12 0NN, EnglandUniv London Imperial Coll Sci Technol & Med, Gastroenterol Sect, Fac Med, London W12 0NN, England