Morrison, Kirsty E ; Colón-González, Felipe J ; Morbey, Roger A... https://researchonline.lshtm.ac.uk/id/eprint/4658835/1/Demographic%20and%20socioeconomic%20patterns%20in%20healthcare-seeking%20behaviour%20for%20respiratory%20symptoms%20in%20England%20a%20comparison%20with.pdf.
,
2020