Institution
- Learning Disabilities Association of Pennsylvania1
- Lincoln TV Center1
- Loyola College in Maryland1
- Loyola University Chicago1
- M and M TV Clinic1
- Massachusetts General Hospital1
- Massachusetts Institute of Technology4
- McGill University1
- McNeil Laboratories1
- Michigan State University1
- Microma Corporation1
- Mikart, Inc.1
- Mobil Research Laboratories1
- Modern Plastics1
- National Academy of Sciences (U.S.)1
- National Institutes of Health (U.S.)1
- New York (State). Department of Health1
- New York University1
- New York University Medical Center1
- Northwestern University (Evanston, Ill.)2