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2. Spontaneous duodenal perforation in neonates;Nazzal;Am Surg,1996
3. Perforation of the gastrointestinal tract in infancy and childhood;Emanuel;Surg Gynecol Obstet,1978
4. Breath-stacking increases the depth and duration of chest expansion by incentive spirometry;Baker;Am Rev Respir Dis,1990
5. Involuntary breath-stacking;Marini;Am Rev Respir Dis,1986