????? 23? ??PCS? ?? ??????(PCS) ??? 4?11?? ???? IMF??? ???? ??? ????. ????? ???? ?? ??? ???? ??? ?? ????. 1?~3?? ??? ????? ‘???’? 57.7%(2?37?)? ??? ??? 3?~5?? ????? ??? 27.5%(1?13?)??. ?? 5?~10?? ??? ??? ???? 11.2%(46?)? ???. 10?? ??? ????? ‘???’? 3.6%(15?)? ????? ?? ??? ? ?? ???.
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