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4. A clinical evaluation of electromyography of the anal sphincter;Bailey, J.A.; Powers, I.J.; Waylonic, G.W.;Arch Phys Med Rehabil,1970
5. Chronic and occult stool retention;Barr, R.G.; Levine, M.D.; Wilkinson, R.H.; Mulvihill, D.;Clin Pediatr (Phila),1979