Study concept and design: Jain, Harris, Morse, O’Connor.
Acquisition, analysis, or interpretation of data: Jain, Ayers, Peterson, Garshick.
Drafting of the manuscript: Jain, Ayers, Peterson, Harris, Garshick.
Critical revision of the manuscript for important intellectual content: Ayers, Peterson, Harris, Morse, O’Connor, Garshick.
Statistical analysis: Jain, Ayers, Peterson, Garshick.
Obtained funding: Garshick.
Administrative, technical, or material support: Peterson, Harris, Morse, O’Connor.
Study supervision: Harris, Morse, Garshick.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Garshick reports receipt of author royalty fees for UpToDate sections on respiratory physiology and respiratory health in chronic spinal cord injury. No other disclosures were reported.
Funding/Support: Dr Jain is supported by funding from National Institute of Arthritis and Musculoskeletal and Skin Diseases project 1K23AR059199 and the Foundation for Physical Medicine and Rehabilitation. Drs Morse and Garshick are supported by VA Rehabilitation Research and Development Merit Review grants B6618R and I01RX000792, National Institute of Health grant AR059270, and US Department of Education National Institute on Disability and Rehabilitation Research grant H133N110010.
Role of the Funders/Sponsors: The funding agencies had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, and approval of the manuscript; or decision to submit the manuscript for publication.
Previous Presentation: An abstract of part of this work was presented at the Association of Academic Physiatrists’ annual meeting; March 8, 2013; New Orleans, LA.