TY - RPRT TI - Optimizing the design of web-based questionnaires--experience from a population-based study among 50,000 women. AU - Alexandra Ekman AU - Asa Klint AU - Paul W Dickman AU - Hans-Olov Adami AU - Jan-Eric Litton PY - 2007 DO - 10.1007/s10654-006-9091-0 UR - https://pubmed.ncbi.nlm.nih.gov/17206467/ ID - 17206467 ER -