Evolution of Ultrasound by Internists: POCUS (Point of Care Ultrasound), abdominal ultrasound and CEUS (Contrast enhanced ultrasound)- Implementation of a CEUS group - Kirsch, M; Treusch, M; Thomer, A; Engel, T; Bopp, K; Weiss, D; LInk, T; Meienberg, A; Bassetti, S (Ultraschall in der Medizin - European Journal of Ultrasound, 2025)