Cognitive interviewing in e- & mHealth research 1

New channel Institute for Mathematical Sciences: title sample judged 'whole' (Nearly all uploads are substantive research-level mathematics lectures, mini-courses, and seminar talks from a universit); passed a second screen for sellers/exam-prep/re-uploads; 1 of 3 sampled transcripts showed teaching, 0 not; every title checked strictly; oEmbed verified.