Trantham L, Sikirica MV, Candrilli S, Benson VS, Mohan D, Neil D, Joshi AV. Healthcare costs and utilization associated with muscle weakness diagnosis codes in patients with chronic obstructive pulmonary disease: a United States claims analysis. J Med Econ. 2019 Apr;22(4):319-27. doi: 10.1080/13696998.2018.1563414.