G-Protein-Coupled Receptor Class C Group 6 Member A (GPRC6A) and Serine Protease Inhibitor, Kazal Type 1 (SPINK1) Genotypes Associated With Refractory Functional Dyspepsia: A Potential Link to Endosonographic Features. - Higashida S; Futagami S; Nakamura K; Agawa S; Habiro M; Kawawa R; Onda T; Tanabe T; Ueki N; Atsukawa M (Cureus, 2025)