NEW YORK & CAMBRIDGE, Mass.--(BUSINESS WIRE)--Pfizer Inc (www.pfizer.com) and Sermo (www.sermo.com), the nation’s largest online physician community, today announced a strategic collaboration designed to redefine the way physicians in the U.S. and the healthcare industry work together to improve patient care. Sermo is a Web-based community where physicians share observations from daily practice, discuss emerging trends and provide new insights into medications, devices and treatments.