The authors declare that there are no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. J. Van Assche developed the study concept. All authors contributed to the study design. Testing and data collection were managed by A. Van Hiel, K. Dhont, and J. Van Assche. J. Van Assche performed the data analysis and interpretation under the supervision of A. Roets and K. Dhont. J. Van Assche drafted the manuscript, and K. Dhont, A. Roets, and A. Van Hiel provided critical revisions. All authors approved the final version of the manuscript for submission.
