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"retrospective single-control study" » "retrospective case-control study", "retrospective study-control study"
"retrospective single-controlled study" » "retrospective case-controlled study", "retrospective study-controlled study"
"retrospective single-control study" » "retrospective case-control study", "retrospective study-control study"
"retrospective single-controlled study" » "retrospective case-controlled study", "retrospective study-controlled study"
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