Fig. 4

Number of articles included in the systematic map per disease analysed and categorized in ten-year publication periods (1978–1988, 1989–1998, 1999–2008 and 2009–2019)
Number of articles included in the systematic map per disease analysed and categorized in ten-year publication periods (1978–1988, 1989–1998, 1999–2008 and 2009–2019)