Is closed circuit TV a worth-while teaching aid?
D001296:Audiovisual Aids; D004504:Education, Medical, Undergraduate; D004521:Educational Measurement; D013502:General Surgery / Q000193:education*; D007360:Intelligence; D007858:Learning; D008568:Memory; D011795:Surveys and Questionnaires; D013663:Teaching; D013690:Television; D013997:Time Factors; D014743:Videotape Recording