Sheldon R., Connolly S., Rose S., Klingenheben T., Krahn A., Morillo C., Talajic M., Ku T., Fouad-Tarazi F., Ritchie D., Koshman ML. Prevention of Syncope Trial (POST): a randomized, placebo-controlled study of metoprolol in the prevention of vasovagal syncope.. „Circulation”. 9 (113), s. 1164–70, marzec 2006. DOI: 10.1161/CIRCULATIONAHA.105.535161. PMID: 16505178.
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Sheldon R., Connolly S., Rose S., Klingenheben T., Krahn A., Morillo C., Talajic M., Ku T., Fouad-Tarazi F., Ritchie D., Koshman ML. Prevention of Syncope Trial (POST): a randomized, placebo-controlled study of metoprolol in the prevention of vasovagal syncope.. „Circulation”. 9 (113), s. 1164–70, marzec 2006. DOI: 10.1161/CIRCULATIONAHA.105.535161. PMID: 16505178.
Madrid AH., Ortega J., Rebollo JG., Manzano JG., Segovia JG., Sánchez A., Peña G., Moro C. Lack of efficacy of atenolol for the prevention of neurally mediated syncope in a highly symptomatic population: a prospective, double-blind, randomized and placebo-controlled study.. „Journal of the American College of Cardiology”. 2 (37), s. 554–9, luty 2001. PMID: 11216978.