“…All included randomized controlled trials (4,081 participants) compared a telephone intervention designed to improve cardiac patients' outcomes directly to standard post-discharge care. Nine of the included studies were conducted in Canada [13,16,20,30,31,32,33,34,35] 8 in Australia [17,[25][26][27][28][29]37,38], 5 in the United States of America [14,[21][22][23]38] 3 in Europe [18,19,24] and 1 in Iran [15]. Thirteen studies had longer than 6 months of follow-up [19,21,22,24,25,26,28,29,30,[31][32][33]38].…”