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The effect on response rates of offering a small incentive with a mailed questionnaire
Marrett, Loraine D., Kreiger, Nancy, Dodds, Linda, Hilditch, ShellyVolume:
2
Year:
1992
Language:
english
DOI:
10.1016/1047-2797(92)90019-M
File:
PDF, 766 KB
english, 1992