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. 2019 Jul 23;2019(7):CD001871. doi: 10.1002/14651858.CD001871.pub4
Study ID Incomea Country
Cao 2015 High‐income China
Feng 2004 High‐income China
Han 2006 High‐income China
Li 2010a High‐income China
Meng 2013 High‐income China
Wang 2012 High‐income China
Mo‐suwan 1998 Upper middle‐income Thailand