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No external funds were used in the preparation of this letter.
Conflict of interest
Philippe Tréchot declares no potential conflicts of interest that might be relevant to the contents of this letter.
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Tréchot, P. Comment on: Levothyrox® New and Old Formulations: Are They Switchable for Millions of Patients?. Clin Pharmacokinet 58, 977–978 (2019). https://doi.org/10.1007/s40262-019-00784-y