TY - JOUR AU - Christensen, Anne Illemann AU - Lynn, Peter AU - Tolstrup, Janne Schurmann PY - 2019 DA - 2019/07/17 TI - Can targeted cover letters improve participation in health surveys? Results from a randomized controlled trial JO - BMC Medical Research Methodology SP - 151 VL - 19 IS - 1 AB - Improving response rates in epidemiologic studies is important for the generalizability of the outcome. The aim of this study was to examine whether it can be advantageous for participation to target different versions of the cover letters to different sample subgroups. SN - 1471-2288 UR - https://doi.org/10.1186/s12874-019-0799-4 DO - 10.1186/s12874-019-0799-4 ID - Christensen2019 ER -