Combining multivariate statistics and the think-aloud protocol to assess Human-Computer Interaction barriers in symptom checkers. - Luis Marco-Ruiz; Erlend Bønes; Estela de la Asunción; Elia Gabarron; Juan Carlos Aviles Solis; Eunji Lee; Vicente Traver 001; Keiichi Sato; Johan Gustav Bellika (J. Biomed. Informatics, 2017)