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. Author manuscript; available in PMC: 2016 Nov 28.
Published in final edited form as: Facial Plast Surg Clin North Am. 2015 Jun 12;23(3):273–283. doi: 10.1016/j.fsc.2015.04.001

FIGURE 1.

FIGURE 1

Venn diagram showing the interrelationship of several databases that may be used in a systematic review. Note the spread of data, spanning the 3 databases and the unpublished data which is not usually retrievable in electronic searches.