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Advance letters as a way of reducing non-response in a National Health Telephone Survey: differences between listed and unlisted numbers [journal article]
Source: Survey Research Methods, 5 (2011) 3. p.103-116
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Author(s): von der Lippe, Elena; Schmich, Patrick; Lange, Cornelia
Source: Survey Research Methods, 5 (2011) 3. p.103-116