The original Appendix 3, which contained the four reading texts, was removed due to copyright concerns.
The enumeration of the appendices has been updated accordingly. The author apologizes for this error and states that this does not change the scientific conclusions of the article in any way. The original article has been updated.
Conflict of interest statement
The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.