Evidence of potential bias in a comparison of ? blockers and calcium channel blockers in patients with chronic obstructive pulmonary disease and acute coronary syndrome: results of a multinational study.
Dong YH, Alcusky M, Maio V, Liu J, Liu M, Wu LC, Chang CH, Lai MS, Gagne JJ. Evidence of potential bias in a comparison of ? blockers and calcium channel blockers in patients with chronic obstructive pulmonary disease and acute coronary syndrome: results of a multinational study. BMJ Open. 2017 03 31; 7(3):e012997.