Acetaminophen use in pregnancy may be linked to ADHD

I had very recently posted information on the best study to date showing acetaminophen to be no better than placebo for acute back pain. This study from JAMA found a significant association between acetaminophen use during pregnancy and attention deficit hyperactivity disorder (ADHD) in children. Jeff Chapa, director of maternal fetal medicine at Cleveland Clinic was quoted as saying "We really should start looking at non-pharmacological ways to deal with pain,"
I and most DC's treat many women during pregnancy. I have several OB's that refer pregnant woman to my office.
Does that surprise anyone?
http://www.usatoday.com/story/news/nation/2014/02/24/acetaminophen-pregnancy-adhd/5782763/

Acetaminophen No Better Than Placebo for Back Pain

Hard to believe that this is the first ever randomized placebo controlled trial of acetaminophen (Tylenol) for acute low back pain. Unfortunately many common procedures in medicine and especially spine care have not been subjected to rigorous research. So you may want to save your liver and not take this drug the next time you have a back injury
Does this finding surprise anyone?
http://well.blogs.nytimes.com/2014/07/23/acetaminophen-no-better-than-placebo-for-back-pain/?_php=true&_type=blogs&_r=0

Research Based Guidelines for the Management of Low Back Disorders

This white board presentation by Dr. Mike Evans, Associate Professor of Family Medicine and Public Health at the University of Toronto does a great job in distilling the current evidence based research on the management of low back disorders...in only about 9 minutes!
The authors of my previous post on cost effectiveness for treatment on work injuries concluded that the cost savings of chiropractic treatment were probably due to the fact that doctors of chiropractic follow the research based guidelines better than other professions.
Why do you think other professions do not do a better job in following the guidelines?
https://www.youtube.com/watch?v=BOjTegn9RuY&feature=youtu.be

In have attended many health fairs and would speak with many people who believed this myth, and others who even said they heard that people could get addicted to chiropractic care! I have received regular ongoing dental treatment since I was a kid and plan on continuing with this into the forseeable future, but I don't go around saying once you go to a dentist you have to keep coming back.
Anybody have any idea where this myth originated?