RT Journal Article SR Electronic T1 Physio-pathology of the internal anal sphincter. JF Archives of Disease in Childhood JO Arch Dis Child FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP 377 OP 381 DO 10.1136/adc.44.235.377 VO 44 IS 235 A1 Duhamel, B. YR 1969 UL http://adc.bmj.com/content/44/235/377.abstract AB