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Abstract
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1 The Catholic University of Korea, Division of Coloproctology, Department of Surgery, College of Medicine, Uijeongbu St. Mary’s Hospital, Uijeongbu‑si, Republic of Korea (GRID:grid.411947.e) (ISNI:0000 0004 0470 4224)
2 Catholic University of Korea, Department of Medical Statistics, College of Medicine, Seoul, Republic of Korea (GRID:grid.411947.e) (ISNI:0000 0004 0470 4224)
3 Soongsil University, Department of Statistics and Actuarial Science, Seoul, Republic of Korea (GRID:grid.263765.3) (ISNI:0000 0004 0533 3568)