R. Steffen

发表

M. Sivak, R. Wyllie, M. Caulfield, 1989, The Journal of pediatrics.

R. Petras, D. Norris, R. Wyllie, 1991, Clinical pediatrics.

M. Goske, R. Wyllie, R. Steffen, 1999, Journal of pediatric gastroenterology and nutrition.

M. Sivak, R. Wyllie, M. Caulfield, 1989, The Journal of pediatrics.

M. Kay, R. Wyllie, M. Caulfield, 1993, The Journal of pediatrics.

M. Kay, L. Mahajan, R. Wyllie, 1996, The American journal of gastroenterology.

M. Kay, L. Mahajan, R. Wyllie, 1997, Journal of pediatric gastroenterology and nutrition.

R. Wyllie, M. Caulfield, R. Steffen, 1994, Journal of pediatric gastroenterology and nutrition.

M. Kay, R. Wyllie, M. Caulfield, 1994, Clinical pediatrics.

L. Mahajan, S. Worley, R. Steffen, 2013, Journal of pediatric gastroenterology and nutrition.

L. Mahajan, R. Steffen, R. Walia, 2009, Current opinion in pediatrics.

V. Fazio, M. Kay, L. Mahajan, 1997, The American journal of gastroenterology.

M. Kay, R. Wyllie, M. Caulfield, 1993, Cleveland Clinic journal of medicine.

V. Fazio, I. Lavery, R. Wyllie, 1994, Journal of pediatric gastroenterology and nutrition.

R. Petras, M. Kay, T. Gramlich, 1997, Clinical pediatrics.

M. Kay, R. Wyllie, R. Steffen, 1996, Clinical pediatrics.

L. Mahajan, R. Steffen, Laura Aylward, 2019, International journal of pediatrics.

L. Mahajan, R. Steffen, Lisa Feinberg, 2008, Journal of pediatric gastroenterology and nutrition.

Tariq Ahmad, G. Banez, L. Mahajan, 2003, American Journal of Gastroenterology.

L. Mahajan, R. Steffen, Katherine Lamparyk, 2017, Journal of pediatric gastroenterology and nutrition.

M. Kay, R. Wyllie, R. Steffen, 1996, The American journal of gastroenterology.

M. Kay, R. Wyllie, M. Caulfield, 1998, Inflammatory Bowel Diseases.