Table 1.

 Characteristics of the 188 patients at inclusion

Age (y)
Mean (SD)	36.4 (20.2)
Median (range)	29 (6–85)
Sex (F/M)	98/90
Time from symptom onset to diagnosis (months)
Mean (SD)	6.9 (10.5)
Median (range)	2 (0.1–72.0)
Clinical follow up duration (months)
Mean (SD)	56.1 (27.4)
Median (range)	67.3 (0.1–92.8)
Histological follow up duration (months)*
Mean (SD)	16.8 (23.2)
Median (range)	2.6 (0.1–84.0)

*Delay between onset and last histological sample either by endoscopic or surgical procedure.