Incidental Findings of Gallbladder and Bile Ducts-Management Strategies: General Aspects, Gallbladder Polyps and Gallbladder Wall Thickening-A World Federation of Ultrasound in Medicine and Biology (WFUMB) Position Paper - Jenssen, C; Lorentzen, T; Dietrich, CF (Ultrasound Med Biol, 2022)