Brigham EP, Anderson JA, Brook RD, Calverley PMA, Celli BR, Cowans NJ, Crim C, Diserens JE, Martinez FJ, McCormack MC, Newby DE, Yates J, Vestbo J, Wu TD, Wise RA. Challenging the obesity paradox: extreme obesity and COPD mortality in the SUMMIT trial. ERJ Open Res. 2021 Jul; 7(3).