Maintaining response rates in longitudinal studies: the care and nurture of respondents.
Freedman
D S
DS
Thornton
A
A
Camburn
D
D
D000569:Americas; D003625:Data Collection; D019049:Developed Countries; D009656:North America; D012106:Research; D012494:Sampling Studies; D014481:United States
Americas; Developed Countries; North America; Northern America; Research Methodology; Sampling Studies; Studies; Surveys; United States