If a subject is assigned to the waitlist, he/she will have the option of enrolling in a free MBSR class after the completion of study visits to the Martinos Center. This free class will be taught by the chief mindfulness teacher who is a certified MBSR instructor. This free class is offered to only as a courtesy expression of thanks for participating in this study. This free class is not a research study: no research data will be collected in this courtesy class; subjects are free to participate or to refuse to participate in this post-study optional class.