Eligibility criteria

NF Neda Firouraghi
BK Behzad Kiani
HJ Hossein Tabatabaei Jafari
VL Vincent Learnihan
JS Jose A. Salinas-Perez
AR Ahmad Raeesi
MF MaryAnne Furst
LS Luis Salvador-Carulla
NB Nasser Bagheri
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Original studies published in peer-reviewed journals which  written in English were considered in this study.

Studies were eligible for inclusion if they met one of the following criteria:

Studies were excluded if:

The reviews and non-peer-reviewed literatures such as editorials, conference or congress papers, book sections, and study protocols were excluded from the study.

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