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. Author manuscript; available in PMC: 2015 Apr 8.
Published in final edited form as: Acta Biomater. 2014 Feb 10;10(6):2354–2366. doi: 10.1016/j.actbio.2014.02.003

Table 1.

The sample size of studies.

No. of patients No. of studies
≤20 55
21–50 20
51–100 9
101–150 5
151–200 5
201–300 2
301–551 3