“…[8][9][10][11][17][18][19][20]22,23,25,31,36,44,62,66 Seven of the pathological series came from one center 10,11,19,20,22,25,44 and three from another group. 23,31,36 The duration of constipation prior to inclusion ranged from at least 6 weeks 51 to 6 years 53,56,63 or a mean duration of 14.6 years 17 or 19 years. 18 A number of studies used Rome II 20,26,35,37,52,62 or Rome III 45,53,56 criteria for defining functional constipation, implying minimum symptom duration as 12 or 6 months, respectively.…”