Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis
| Main Authors: | , , , , , , |
|---|---|
| Format: | Online |
| Language: | English |
| Published: |
BioMed Central
2014
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3898011/ |