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none, none. “Calendar”. Global Heart 6, no. 2 (2011): 1. DOI: http://doi.org/10.1016/S1875-4570(11)00033-7

none, none. “Calendar”. Global Heart, vol. 6, no. 2, 2011, p. 1. DOI: http://doi.org/10.1016/S1875-4570(11)00033-7