16
Participants
Start Date
Not specified
Flexible Sigmoidoscopy
Rectal Biopsy
David Geffen School of Medicine at UCLA, Los Angeles
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
National Institute on Drug Abuse (NIDA)
NIH
National Institute of Mental Health (NIMH)
NIH
National Institute of Allergy and Infectious Diseases (NIAID)
NIH