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Relationship between the proportion of respondents willing to use thyroxine (T4)+triiodothyronine (T3) combination therapy in five European countries in patients with persistent symptoms despite a normal thyroid stimulating hormone on levothyroxine, and their annual per capita gross domestic product (GDP) in 2019 given as percentage of the world’s average. BG, Bulgaria [37]; RO, Romania [35]; PL, Poland [36]; IT, Italy [33]; DK, Denmark [34].
