Unusual type of preexcitation. I. Short P-R interval.

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@article{Castellanos1976UnusualTO, title={Unusual type of preexcitation. I. Short P-R interval.}, author={A. Castellanos and M T Leu and Saroja Bharati}, journal={The American journal of cardiology}, year={1976}, volume={38 5}, pages={669-70} }