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Contributors RIW contributed to the drafting of the manuscript for content, study concept and design, analysis or interpretation of data, study supervision, acquisition of data, statistical analysis. HHL contributed to the revising of the manuscript for content, study concept or design and analysis of data. MS, MG, INS, CAW, MAGCS, KPJB, DD contributed to the revising of the manuscript for content and acquisition of data. LHvdB contributed to the revising of the manuscript for content, study concept and design and interpretation of data. W-LvdP contributed to the drafting and revising of the manuscript for content, including writing for content, analysis or interpretation of data revising of the manuscript for content, study concept and design, interpretation of data, statistical analysis, study supervision and obtaining funding. W-LvdP and RIW had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Funding This study was supported by grants from the Prinses Beatrix Spierfonds (WAR08-24) and the Stichting Spieren voor Spieren.
Disclaimer The funders had no role in study design, data collection, data analysis or interpretation, writing the report or decisions in submitting this manuscript.
Competing interests LHvdB serves on scientific advisory boards for the Prinses Beatrix Spierfonds, Thierry Latran Foundation, Biogen Idec and Cytokinetics; received an educational grant from Baxter International; serves on the editorial board of Amyotrophic Lateral Sclerosis and the Journal of Neurology, Neurosurgery and Psychiatry; and receives research support from the Prinses Beatrix Spierfonds, Netherlands ALS Foundation, the European Community's Health Seventh Framework Programme (grant agreement number 259867), the Netherlands Organization for Health Research and Development (Vici Scheme, JPND (SOPHIA, STRENGTH)). W-LvdP receives research support from the Prinses Beatrix Spierfonds, Netherlands ALS Foundation and Stichting Spieren voor Spieren.
Ethics approval Medical Ethical Committee of the University Medical Centre Utrecht.
Provenance and peer review Not commissioned; externally peer reviewed.