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. 2021 Mar 17;2021(3):CD013732. doi: 10.1002/14651858.CD013732.pub2
Study Reason for exclusion
Akkermans 2015 Wrong patient population
Anand 2008 Wrong study design
Bell 1987 Wrong study design
Bergqvist 2007 Wrong study design
Hwang 1999 Wrong study design
Palmer 2005 Wrong study design
Perlman 2005 Commentary