Efficacy of Ecabet Sodium for Eradication with Sequential Therapy - Seol So; Ji Yong Ahn; Hee Kyong Na; Kee Wook Jung; Jeong Hoon Lee; Do Hoon Kim; Kee Don Choi; Ho June Song; Gin Hyug Lee; Hwoon-Yong Jung (The Korean Journal of Helicobacter and Upper Gastrointestinal Research)