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Analysis of chronic obstructive pulmonary disease exacerbations with the dual bronchodilator QVA149 compared with glycopyrronium and tiotropium (SPARK): a randomised, double-blind, parallel-group study[J] . Jadwiga A Wedzicha,Marc Decramer,Joachim H Ficker,Dennis E Niewoehner,Thomas Sandstr?m,Angel Fowler Taylor,Peter D’Andrea,Christie Arrasate,Hungta Chen,Donald Banerji.The Lancet Respiratory Medicine . 2013 (3)