Single breath counting is an effective screening tool for forced vital capacity in ALS

Colin Quinn1 Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, USACorrespondence[email protected]

Corey T. Mcmillan1 Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, USA

Margaret A. Owegi2 Department of Neurology, University of Massachusetts Medical School/UMass Memorial Medical Center, Worcester, MA, USA

Kelly Almasy1 Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, USA

Catherine Douthwright2 Department of Neurology, University of Massachusetts Medical School/UMass Memorial Medical Center, Worcester, MA, USA

Diane Mckenna-Yasek2 Department of Neurology, University of Massachusetts Medical School/UMass Memorial Medical Center, Worcester, MA, USA

Namita A. Goyal3 Department of Neurology, University of California, Irvine, CA, USA and

James Berry4 Healey Center at Massachusetts General Hospital, Boston, MA, USA

Robert H. Brown2 Department of Neurology, University of Massachusetts Medical School/UMass Memorial Medical Center, Worcester, MA, USA

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