not sure if john is referring to clinical trials vs. unproven alternative methods that may have improvement just based on placebo affect. if he is referring to the latter, then welcome to the internet and remember, if it sounds too good to be true it usually is.

for an interesting discussion of the failed clinical gene therapy trials, transplant studies and why phase1 results may have been so good.
http://www.theparkinsonsgroup.com/CM...r=Park10_Part2

btw john, drawing conclusions from your handedness trial is imho useless as are most internet polls. you can't verify if anyone is telling the truth, even if they have pd or gendor and it's likely you aren't sampling a normal pd population distribution.