Hypolactasia and ulcerative colitis.

@article{Pea1973HypolactasiaAU,
  title={Hypolactasia and ulcerative colitis.},
  author={Amado Salvador Pe{\~n}a and Sidney C. Truelove},
  journal={Gastroenterology},
  year={1973},
  volume={64 3},
  pages={400-4}
}