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The following changes have been made to the text.
Final sentence of Sect. 3.1 should read as follows:
In addition to test criterion validity, respondents were asked to score 13 items that are contained in the Patient Activation Measure® (PAM®) [16].
The original article has been updated accordingly.
The online version of the original article can be found under doi:10.1007/s40271-015-0131-2.
