The Cost-Effectiveness of Adding Helicobacter Pylori Screening to the National Gastric Cancer Screening Program in Korea: Protocol for a Cost-Effectiveness Modeling Study - Seowoo Bae; Joon Sung Kim; Moon Won Lee; Gwang Ha Kim; Young-Il Kim; Woon Tae Jung; Gwang Ho Baik; Beom Jin Kim; Joongyub Lee; Mina Suh; Jae Gyu Kim (JMIR Research Protocols)