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Iwagami, M and Tomlinson, LA (2020). Therapy codelist - Oral corticosteroid. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00001689.

Iwagami, M, Tomlinson, LA, Mansfield, KE, Douglas, IJ, Smeeth, L and Nitsch, D (2018). Therapy Codelist - Steroid. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00000894.