Fig 1.
Flowchart of the search process.
Flowchart of the primary search (time period between 01.01.1960 and 31.03.2015) the updated search (time period of 2015 and 2016), and the inclusion and exclusion process. From: Moher D, Liberati A, Tetzlaff J, Altman DG, The PRISMA Group (2009). Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement. PLoS Med 6(7): e1000097. doi:10.1371/journal.pmed1000097. For more information, visit www.prisma-statement.org.
Table 1.
Summary of the included studies.
Table 2.
Levels of evidence and conduct quality.
Table 3.
Best evidence synthesis according to tasks, learning level and practice order.
Fig 2.
The distribution of the publication years of the articles included in this systematic review.