<style face="normal" font="default" size="100%">Reliable assessment of the effects of treatment on mortality and major morbidity, II: observational studies</style>

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0<style face="normal" font="default" size="100%">Reliable assessment of the effects of treatment on mortality and major morbidity, II: observational studies</style><style face="normal" font="default" size="100%">Reliable assessment of the effects of treatment on mortality and major morbidity, II: observational studies</style>