“…These studies used tools developed for generic usability studies, and questionnaires played an important role (1, 6, 8-9, 18, 25, 28, 34-36, 38). Efficiency of performing a certain system function was measured in several studies, mostly as time spent filling in a single form or searching a data item (N = 9, 23%) (1,6,9,14,18,28,(33)(34)(35).…”