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. 2014 Oct 3;9(10):e109490. doi: 10.1371/journal.pone.0109490

Figure 1. Histogram of time-points of acquisition.

Figure 1

Participants were recruited in winter semester 2011 and summer semester 2012. Lecture periods within these semesters were 17. Okt.2011-11. Feb.2012 and 16. Apr.2012–21. Jul.2012.