Validation of ICD-10 codes used to identify the main reason for hospitalization due to hyponatremia in Sweden. - Bergh Fahlén, Cecilia; Issa, Issa; Sahlander, Fredrik; Lindh, Jonatan D.; Calissendorff, Jan; Falhammar, Henrik; Skov, Jakob; Mannheimer, Buster (PLoS ONE, 2025)