Diagnostic potential of total serum ghrelin in autoimmune gastritis: A systematic review and meta-analysis - Iqbal Taufiqqurrachman; Andro Pramana Witarto; Ari Fahrial Syam; Murdani Abdullah; Sigit Ari Saputro; Irine Normalina; Muhammad Miftahussurur; Yoshio Yamaoka (PLoS ONE, 2026)