Risk factors for first intestinal surgery in Crohn's disease - Novacek, G; Reinisch, W; Reinisch, S; Primas, C; Eigner, W; Vogelsang, H; Dejaco, C; Kazemi-Shirazi, L; Niapir, M; Mekhail, P; Pedarnig, N; Angermann, H; Waldhör, T (Zeitschrift für Gastroenterologie, 2019)