The effect of MElatonin on Depressive symptoms, Anxiety, CIrcadian and Sleep disturbances in patients after acute coronary syndrome (MEDACIS): study protocol for a randomized controlled trial. - Madsen, Michael Tvilling; Isbrand, Anders; Andersen, Ulla Overgaard; Andersen, Lars Juel; Taskiran, Mustafa; Simonsen, Erik; Gögenur, Ismail (Trials, 2017)