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. 2014 Sep 24;9(9):e106930. doi: 10.1371/journal.pone.0106930

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© 2014 Kräenbring et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Readability was assessed using the Amstad readability index (R_Amstad) and the Erste Wiener Sachtextformel (R_{1. WSTF}). The scale of R_Amstad is from 0 (very difficult) to 100 (easy to read), for R_{1. WSTF} from 4 (easy to read) to >12 (very difficult). n = 10.