Do you understand how medical knowledge in North America came under the control of a single professional model, financed by industrial capital and repeated a century later? Health scientist Sarena L. McLean, MSc (Epidemiology and Biostatistics).Do you understand how medical knowledge in North America came under the control of a single professional model, financed by industrial capital and repeated a century later? Health scientist Sarena L. McLean, MSc (Epidemiology and Biostatistics).