Dr. Hiroki Nishikawa works in the Second Department of Internal Medicine at Osaka Medical College (Takatsukishi, Osaka, Japan). He is the Guest Editor of the Special Issue "Sarcopenia and Gastrointestinal Disease" and a Section Board Member of journal JCM in MDPI. His main research interests include liver cirrhosis, sarcopenia, liver-gut axis, viral hepatitis, hepatocellular carcinoma, frailty, malignancies, NASH, and interventional radiology. His scientific output includes 258 publications, corresponding to 4237 citations (h-index 33) (Scopus, 22 November 2023).