@Bio I'm sure the participants had to sign Non Disclosure Agreements (NDAs), but understand not everyone would follow them. It might make you feel better to find a participant, but whether they had a great or horrible experience it wouldn't really be significant in the bigger picture of statistics.
I think the fact MK is an orphan drug status and is helping an unmet medical need it has a VERY high probability of being accepted by FDA. Price action seems to indicate the market is agreeing. Also, GK is revelling publicly about the burning of shorts. He doesn't seem concerned in the least bit and hasn't been holding back any punches out of caution. I believe they believe, and they know more than ANY of us.