F.M. Abarca Rendon, N. McKenna, A. Ofshteyn, T. Peponis, K. Behm, W. Perry, S. Kelley, K.L. Mathis, Mayo Clinic Minnesota, Rochester, Minnesota, UNITED STATES|M. Puga Tejada, Instituto Ecuatoriano de Enfermedades Digestivas (IECED), Guayaquil, ECUADOR|