1. b-interferon-1b parallel group (RR) 60^75 IFNB Study Group (1995)
2. b-interferon-1b baseline crossover (RR) 75 Stone et al. (1995)
3. b-interferon-1a parallel groups (RR) 50 Jacobs et al. (1996)
4. b-interferon-1a parallel groups (RR) 75 PRISMS (1998)
5. b-interferon-1b parallel groups (SP) ca. 75 European Study Group (1998)