Response to letter to the editor regarding "Application of principal component analysis in clinical gait research"

Affiliations

• ¹ Department of Neuroscience, Faculty of Medicine, Norwegian University of Science and Technology NTNU, 7489 Trondheim, Norway; Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway. Electronic address: peter.federolf@ntnu.no.
• ² Department of Kinesiology, University of Massachusetts-Amherst, Amherst, MA, USA.
• ³ Department of Mechanical Engineering, Stanford University, USA; Department of Orthopedic Surgery, Stanford University, USA; Veterans Administration, Palo Alto, CA, USA.