<style face="normal" font="default" size="100%">Excessive work hours of physicians in training in El Salvador: putting patients at risk.</style>

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0<style face="normal" font="default" size="100%">Excessive work hours of physicians in training in El Salvador: putting patients at risk.</style><style face="normal" font="default" size="100%">Excessive work hours of physicians in training in El Salvador: putting patients at risk.</style>