2.3. Data extraction and outcome measurements

Two reviewers (NK and AF) independently screened the titles and abstracts and evaluated the full texts of the selected articles. Any disagreements were resolved through discussion between the reviewers (NK and AF). The following variables were extracted: author, publication year, article type, participants, country in which the study was conducted, research period, duration of diet therapy, difficulties in continuing the diet therapy, and the effectiveness of telemedicine/tele-follow-up.