@article{862ba113d42f4cb7891045e4a0a90eb8,
title = "Effects of estimated completion time and unconditional gift certificates on questionnaire response",
keywords = "Female, Humans, Motivation, Postal Service, Reward, Surveys and Questionnaires",
author = "{van Gelder}, {Marleen M H J} and Geuijen, {Pauline M} and {de Vries}, {Jeanne H M} and Nel Roeleveld",
year = "2017",
month = may,
doi = "10.1136/jech-2016-208555",
language = "English",
volume = "71",
pages = "520",
journal = "Journal of Epidemiology and Community Health",
issn = "0143-005X",
publisher = "BRITISH MED JOURNAL PUBL GROUP",
number = "5",
}