== Removed Cite errors == 

 Here, I removed the references because they were empty references and created citation errors.  Look at the bottom of the page in ==References== and you will see 2 consecutive reference (references 168 and 169) errors: 

 Cite error: Invalid  tag; no text was provided for refs named Ernst2006; see Help:Cite errors/Cite error references no text 

 and 

 Cite error: Invalid  tag; no text was provided for refs named Cochrane_back_2005; see Help:Cite errors/Cite error references no text 

 in big red font.~~~~