Reply to: Room for methodological improvement in gait speed study for COPD patients

Affiliations

• ¹ Harefield Respiratory Research Group, Royal Brompton & Harefield Hospitals, Guy's and St. Thomas' NHS Foundation Trust, London, UK.
• ² Harefield Pulmonary Rehabilitation Unit, Royal Brompton & Harefield Hospitals, Guy's and St. Thomas' NHS Foundation Trust, London, UK.
• ³ Contributed equally.
• ⁴ Harefield Respiratory Research Group, Royal Brompton & Harefield Hospitals, Guy's and St. Thomas' NHS Foundation Trust, London, UK r.barker2@rbht.nhs.uk.
• ⁵ National Heart & Lung Institute, Imperial College, London, UK.
• ⁶ Dept of Respiratory Medicine, The Hillingdon Hospital NHS Trust, London, UK.
• ⁷ Dept of Medical Statistics, Research & Development, Royal Brompton & Harefield Hospitals, Guy's and St. Thomas' NHS Foundation Trust, London, UK.
• ⁸ Dept of Respiratory Medicine, Royal Brompton & Harefield Hospitals, Guy's and St. Thomas' NHS Foundation Trust, London, UK.
• ⁹ Dept of Occupational and Environmental Medicine, Imperial College, London, London, UK.