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BMJ.2.6149.1419
BMJ.2.6149.1419
http://dx.doi.org/10.1136/BMJ.2.6149.1419
Professionals as responders: variations in and effects of response rates to questionnaires, 1961-77.
P356
Q55113735-F29FC9FA-4E75-41FF-99CF-BBA298C32807
P356
BMJ.2.6149.1419
http://dx.doi.org/10.1136/BMJ.2.6149.1419