Prolonged PR interval, first-degree heart block and adverse cardiovascular outcomes: a systematic review and meta-analysis.

Kwok CS, Rashid M, Beynon R, Barker D, Patwala A, Morley-Davies A, Satchithananda D, Nolan J, Myint PK, Buchan I, Loke YK, Mamas MA. Prolonged PR interval, first-degree heart block and adverse cardiovascular outcomes: a systematic review and meta-analysis. Heart. 2016 May; 102(9):672-80.

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