Davidson, J, Warren-Gash, C and Mcdonald, H (2021). Clinical codelist - CPRD Aurum - chronic respiratory disease. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00002214.

Davidson, J, Warren-Gash, C and Mcdonald, H (2021). Clinical codelist - CPRD GOLD - chronic respiratory disease. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00002215.

Davidson, J, Warren-Gash, C, Mcdonald, H, Banerjee, A, Smeeth, L, Strongman, H and Cadogan, S (2021). Codelists for: "Ethnic differences in the incidence of clinically diagnosed influenza: an England population-based cohort study 2008-2018". [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00002102.

Forbes, H, Bhaskaran, K, Thomas, SL, Smeeth, L, Clayton, T and Langan, S (2014). Clinical code list - COPD codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.165.

Forbes, H and Strongman, H (2019). Covariate Code List - COPD. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00001134.

Iwagami, M, Caplin, B, Smeeth, L, Tomlinson, LA and Nitsch, D (2018). Clinical Codelist - Read codes for COPD. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00000859.

Muzambi, R (2020). Clinical codelist - Chronic Obstructive Pulmonary Disease ICD-10 codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00002037.

Muzambi, R (2020). Clinical codelist - Chronic Obstructive Pulmonary Disease read codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00002036.

Quint, J (2020). Clinical codelist - Cough (used to help detect COPD exacerbations). [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00001649.

Quint, JK (2020). Clinical codelist - Sputum (used to help detect COPD exacerbations). [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00001650.

Scholten, F and Seeley, J (2011). SAGE Well-Being of Older People Study-2009, Wave 1. [Data Collection]. WHO Multi-Country Studies Data Archive. https://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/10/

Seeley, J, Mugisha, J and Suzman, R (2014). SAGE Well-Being of Older People Study-2013, Wave 2. [Data Collection]. WHO Multi-Country Studies Data Archive. https://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/210