Keyashian, K.; Duregon, E.; Brinkerhoff, B.; Bradley, L.; Larson, B.; Lim, J.; Modiano, N.; Collins, J.; Morgan, T.; Hooper, J. Uses and Limitations of IgG4 Positive Plasma Cells in Evaluating Ulcerative Colitis. JGLD 2017, 26, 425-429.