Montreal Classification of Crohn's Disease
Age at diagnosis (A1-A3):
   A1: < 16 yo
   A2: 16-40 yo
   A3: > 40 years
Location (L1-L4):
   L1: ileal
   L2: colonic
   L3: ileocolonic
   L4: upper Gl
Behavior (B1-B3 + p):
   B1: Inflammatory
   B2: Stricturing (inflamm, fibrostenotic)
   B3: Penetrating (fistula, abscess)
   p: Perianal

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