*3.1. Study Selection*

A database search identified 613 records, of which 19 articles met the eligibility criteria [6–13,23–33]. Citation searching of the eligible articles further identified two articles [34,35]. Thus, twenty-one articles were included in this review. These articles were published in 2011 and later. The study selection flow is presented in Figure **??**. Excluded studies based on full-text assessment are shown with reasons for exclusion in Table S3 in the Supplementary Materials.
