 Complete the following phrase:  Meissner withdrew from the 2009 U.S. Nationals due to a hip flexor injury that occurred during an off-ice training session, while sprinting on a treadmill, and exacerbated while training jumps on the ice.  She went through physical therapy back in Baltimore, but the pain was too much to complete her jumps and fully compete.  She stated that she hoped that she would recover in order to compete at the 