Thyroid hormone replacement therapy in primary hypothyroidism: a randomized trial comparing L-thyroxine plus liothyronine with L-thyroxine alone. - Escobar-Morreale,HF.; Botella-Carretero,JI.; Gomez-Bueno,M.; Galan,JM.; Barrios,V.; Sancho,J. (Ann Intern Med, 2005)