Varying levels of difficulty index of skills-test items randomly selected by examinees on the Korean emergency medical technician licensing examination von Koh, Bongyeun, Hong, Sunggi, Kim, Soon-Sim, Hyun, Jin-Sook, Baek, Milye, Moon, Jundong, Kwon, Hayran, Kim, Gyoungyong, Min, Seonggi, Kang, Gu-Hyun

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