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. 2019 Sep 19;14(9):e0222593. doi: 10.1371/journal.pone.0222593

Fig 1. Study design.

Fig 1

* Based on Nurjono et al. (2016) [13] and Valentijn et al. (2015) [19]. ** Based on Bautista et al. (2016) [6], Uijen et al (2012) [16], and search of grey literature [22, 35–37].