Title of article :
Extrahepatic cholestasis: The role of ultrasonography and computed tomography (In Spanish) : Tobajas Asensio E, Simón Marco MA, Artigas Martin JM, Tobajas Asensio JA (Policlinica del Aire de Zaragoza, C/Pedro Cerbuna, 39–41 (bajos), E-50009 Zaragoza, Spai
