Sonographic Measurements of Intrahepatic Inferior Vena Cava, Liver Span, and Common Bile Duct: Normative Data and Respiratory Variability in Adult Nigerian Population - Mohammed Lawan Mohammed; Maryam Abba Goni; Ibrahim Abba Tijjani; Umar Hassan Umar; Abubakar Farate; Zara Mohammed Bata; Zara Baba Shettima; Ruqayyatu Abubakar Imam (West African Journal of Allied Health Sciences, 2026)