 Complete the following phrase:  In 2010, the self-described historian Don Shelton questioned the methods by which Smellie performed his research. In the Journal of the Royal Society of Medicine he suggested that Smellie and his collaborator and later competitor William Hunter were responsible for multiple murders of pregt women in order to gain access to corpses for anatomical dissection and physiological experimentation. Due to the inadequate match between supply and demand of corpses, scientists had to find other means, often requiring illegal methods, to obtain access. Shelton proposed that these two physicians used what would later be named burking, after murderer 