1 Thomas Jefferson University, Department of Physical Therapy, 901 Walnut St. Suite 510, Philadelphia PA 19107, USA. Electronic address: susan.duff@jefferson.edu.
2 Aaron & Winthrop Hand Therapy Services, Inc, 2723 Amherst Houston, TX 77005, USA.
3 Division of Biokinesiology & Physical Therapy, Ostrow School of Dentistry and Department of Pediatrics, Keck School of Medicine, University of Southern California, 1540 Alcazar St., CHP 155, Los Angeles CA 90089-9006, USA.