Induction or Exacerbation of Psoriasis in Patients with Crohn's Disease under Treatment with Anti-TNF Antibodies. - Barthel, Christiane; Biedermann, Luc; Frei, Pascal; Vavricka, Stephan R.; Kündig, Thomas; Fried, Michael; Rogler, Gerhard; Scharl, Michael (Digestion, 2014)