“…The initial search strategy retrieved 1,168 articles by July 1st, 2011; after screening all titles, abstracts, and texts, overall 49 full-text articles were identified, 23 of which [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34] were excluded due to various reasons shown in Appendix 1. Thus, 26 full articles were retrieved for further detailed evaluation.…”