Pedley, D. K.; Brett, C; Nichol, N (2002). "P-R segment depression: An early diagnostic feature in acute pericarditis: A telephone survey of UK accident and emergency departments". European Journal of Emergency Medicine. 9 (1): 43–5. doi:10.1097/00063110-200203000-00010. PMID11989495.
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pubmed.ncbi.nlm.nih.gov
Pedley, D. K.; Brett, C; Nichol, N (2002). "P-R segment depression: An early diagnostic feature in acute pericarditis: A telephone survey of UK accident and emergency departments". European Journal of Emergency Medicine. 9 (1): 43–5. doi:10.1097/00063110-200203000-00010. PMID11989495.