Compare the Expression of VDR, Cell Proliferation (by Ki67 Statin), and Apoptosis (by CK18 Staining) in three Different Parts, Including Gastritis (non-Dysplasia or Tumor), IM (Premalignant Area), and Gastric Adenocarcinoma (Malignant Site) by Artificial Intelligence (AI) Using Computer Software to Prevent Manual or Inter-Observer Bias for IHC Score Counting;. The gene discussed is KRT18; the disease is gastritis.