Shalev and Asbjornsen also found that success (. the saving resulted) of reverse auctions correlated most closely with competition. The literature widely supported the importance of competition as the primary driver of reverse auctions success.  Their findings appear to support that argument, as competition correlated strongly with the reverse auction success, as well as with the number of bidders. 
Therapeutic ultrasonography appears to have no value in the treatment of acute ankle sprain. A Cochrane review examined five trials (572 total participants), although only one trial was high quality. 27 None of the placebo-controlled trials demonstrated a difference between true and sham ultrasonography for any outcome measure after seven to 14 days. 27
Or, suppose you’re writing about energy and pollution. You contrast fossil fuels with solar power, deciding on this thesis statement:
Eressea is passionate about education, and believes strongly that educating people about their body provides more opportunity for her patients to manage their own health effectively. She particularly enjoys treating chronic conditions such as long standing headaches and neck pain, along with an interest in treating babies and young children.