Combined thyroxine/liothyronine treatment does not improve well-being, quality of life, or cognitive function compared to thyroxine alone: a randomized controlled trial in patients with primary hypothyroidism. - Walsh,JP.; Shiels,L.; Lim,EM.; Bhagat,CI.; Ward,LC.; Stuckey,BG.; Dhaliwal,SS.; Chew,GT.; Bhagat,MC.; Cussons,AJ. (J Clin Endocrinol Metab, 2003)