Effect of prize draw incentive on the response rate to a postal survey of obstetricians and gynaecologists: A randomised controlled trial. [ISRCTN32823119]
AUTOR(ES)
Moses, Sharon H
FONTE
BioMed Central
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=449720Documentos Relacionados
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