University of California, Irvine, Irvine, California, United States
Jackson South Community Hospital, Miami, Florida, United States
John Muir Medical Center, Concord, California, United States
University of California, Irvine Medical Center, Orange, California, United States
University of California at Irvine, Orange, California, United States
University of California, Irvine Medical Center, Orange, California, United States
University of California Irvine Medical Center, Orange, California, United States
UC Irvine Medical Center, Orange, California, United States
UC Irvine Medical Center, Orange, California, United States
Long Beach VA Medical Center, Long Beach, California, United States
University of California Irvine Medical Center, Orange, California, United States
Jamaica Hospital, Jamaica, New York, United States
Hosted Study Website Tweet2Quit@Merage.Uci.Edu, Irvine, California, United States
University of California Irvine, Irvine, California, United States
University of California, Irvine Medical Center, Orange, California, United States