“…As shown in Figure 7b, keywords occurring in 2019 according to the number of occurrences were ranked as follows: challenges (87), engagement (78), and higher education (79). Keywords occurring in 2018 were as follows: augmented reality (819), mixed reality (118), outcomes (84), mobile learning (80), motivation (79), framework (75), games (70), perceptions (65), meta-analysis (58), attitudes (57), acceptance (47), cognitive load (47), and immersion (46). Keywords occurred the earliest in 2012 were as follows: operating-room (158), laparoscopy (132), acquisition (113), technical skills (87), laparoscopic surgery (84), computer simulation (66), Internet (58), and multimedia (47).…”