“…Through screening of titles and abstracts, we excluded 2670 records, leaving 197 to be assessed as full text. Of these, we finally included in this review 35 studies ( 5 , 8 , 11 , 12 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ), of which 3 were pre-prints ( 5 , 23 , 50 ), three were presented as research letters ( 21 , 43 , 51 ) and three were presented as research communications ( 22 , 31 , 44 ). The reasons for excluding 162 articles are listed in the PRISMA flow chart (see Figure 1 ) ( 52 ).…”