Pubmed would be a good place to look- though usually you'll just get an abstract- so if you found something that looked promising you'd have to go directly to the particular journal's website (many will then will want to charge you if you aren't a subscriber, though it varies and some will allow you to look at some or all articles for free).

However, I'm doubtful that there is any quality data on this topic. Even for more mainstream chiropractic treatments like back pain, there's only a handful of articles in traditional peer reviewed medical journals.

Good luck.