Boughanim M, Benachi A, Dreux S, Delahaye S, Muller F. Nonvisualization of the fetal gallbladder by second-trimester ultrasound scan: strategy of clinical management based on four examples. Prenat Diagn. 2008 Jan;28(1):46–8. doi: 10.1002/pd.1912. PMID: 18186137.