by Johnson, Paul A., Campbell, Donald R., Antonson, Clark W., Weston, Allan P., Shuler, Frederick N., Lozoff, Richard D.
Published in Gastrointestinal endoscopy (01.03.1993)

by Ogren, F P, Huerter, J V, Pearson, P H, Antonson, C W, Moore, G F
Published in The Laryngoscope (01.08.1987)