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. 2019 May 7;11:4201–4207. doi: 10.2147/CMAR.S195219

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© 2019 Kuroda et al.

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Removal of the drainage tube within 4–6 hrs (the black bar area), within 24 hrs (the gray-dotted area), and after two or more postoperative days (the gray area). *A p-value <0.05 was considered significant.