2. Autologous injection of PRP has been found to be safe. The system being used was chosen for its closed system to prevent contamination and for its ease of use. Although safe, internal monitoring of PRP injection safety will also be performed. The study coordinator will assess each PRP injection subject 3 days after treatment with the following question during a brief telephone interview: "Do you think that you have had any side effects from the injection you've received?" [If "Yes"] "Please tell me more about that." Information regarding side effects and adverse events will be made available to the PI, who will decide if the subject requires further medical care.