Review the provided link and answer the following questions illustrated below
https://highered.mheducation.com/sites/dl/free/0073373702/855241/CampbellEwaldPumpsAwarenessintoTheAmericanHeartAssociation.pdf.
What types of studies were involved in Campbell-Ewald's respect initiative?
What are the strengths and weaknesses of the various methodologies?
How do the methodologies complement each other?