J. F Beltrame, A. J Weekes, C Morgan, R Tavella and J. A. Spertus
Archives of Internal Medicine 169 ( 16 ): 1491 - 1499 , 2009
J. A Grantham, P. G Jones, L Cannon and J. A. Spertus
Circulation: Cardiovascular Quality and Outcomes 3 ( 3 ): 284 - 290 , 2010