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

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