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Table 1 Study Location and Year of Publication

From: The efficacy of multiple versus single hyaluronic acid injections: a systematic review and meta-analysis

Characteristic Total (%) (N = 30)
Year of Publication
 1985–1989 1 (3.3)
 1990–1994 4 (13.3)
 1995–1999 3 (10.0)
 2000–2004 6 (20.0)
 2005–2009 8 (26.7)
 2010–2014 7 (23.3)
 2015–2016 1 (3.3)
Study Location
 Europe 19 (63.3)
 North America 7 (23.3)
 Asia 3 (10.0)
 Australia 1 (3.3)
 South America 0 (0.0)
 Africa 0 (0.0)