Regional differences in the validity of self-reported use of health care in Belgium: selection versus reporting bias.
Johan Van der HeydenR CharafeddineD De BacquerJ TafforeauK Van HerckPublished in: BMC medical research methodology (2016)
Cautiousness is needed to interpret self-reported use of health care, especially for ambulatory care. Regional differences in self-reported health care use may be influenced by regional differences in the validity of the self-reported information.