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BMJ.319.7208.478
BMJ.319.7208.478
http://dx.doi.org/10.1136/BMJ.319.7208.478
Population based study of social and productive activities as predictors of survival among elderly Americans.
P356
Q33644825-C6B999AB-937D-46A5-B75A-22B88B20BB90
P356
BMJ.319.7208.478
http://dx.doi.org/10.1136/BMJ.319.7208.478