Correction

The original article [1] contained a major error whereby Fig. 1 mistakenly displayed a duplicate of Fig. 5. The correct version of Fig. 1 has now been restored and can be viewed ahead.

Fig. 1
figure 1

Flowchart for classification of studies into six categories which are indicated in colour. Similar colour scheme is followed in Figs. 3, 4, 5, and 6 in the results section

Furthermore, this error was mistakenly introduced by the production team that handled this article and as such, was not the fault of the authors.