The sampling procedure was clearly described in the initial manuscript. For phase 1: “All participants of the first phase were students from from 1st to 6th year (undergraduate 1st to 2th year, graduate 3th to 6th year) from German Universities. The inclusion criteria were to actively study medicine and their agreement for their voluntarily participation. In the same way, the exclusion criteria were to have suspended their studies, as well as other exceptional situations. Prior to start, informed consent was obtained, which was followed by the collection of telephone numbers and email addresses. They were selected purposely and consecutively, in part by snowball until theoretical saturation was reached.” For phase 2: “For the second, quantitative study phase identical inclusion/exclusion criteria applied.” This referred to medical students of all semesters, excluding students from other faculties. “The online survey was sent to all medical faculties in Germany from which most forwarded the survey invitation by email to about 80 000 medical students to fulfill the principle of maximum diversity through convenience sampling method. Each contained an invitation letter and an information sheet.” Surely, sampling procedures in mixed method studies are phase depended different.
I suggest the authors to replace this with appropriate phrase.