A process for preparing a compound of the formula . These are configured to cause interference between a beam from the laser source and a beam coming from the optical fiber. In addition, a large dorsal area that is cut out allows access to the foot for patient assessment or for the application of an externalintermittent pneumatic compression device that is often needed to be used with the patient who needs orthopedic traction. The bar code reading device can attempt to decode a bar code symbol represented in captured image data whether the first operating state or the alternative operating state is active.