Of those patients who participated in PEGASUS-D FAS clinical trial, patient must sign the informed consent form in order to participate in this extension study.~Collection of retrospective cohort data~1)The medical records from the subject's gastrectomy surgery date to Visit1 will be collected through a questionnaire and by reviewing the medical records of the patient.~Collection of prospective cohort data~Based on visit 1, if the subjects whose date of gastrectomy surgery date is more than 3 years(36 months) and less than 5 years(60 months), the subject should visit the institution at the time of 5 years(60 months, visit2) after gastrectomy surgery to evaluate data requested at visit2.~The medical records will be accessed and collected from the subject's gastrectomy surgery date up to 5 years(60 months)
Of those patients who participated in PEGASUS-D FAS clinical trial, patient must sign the informed consent form in order to participate in this extension study.~The medical records of the patients will be reviewed throughout the study.