Combined chemoradiotherapy vs. radiotherapy alone for early stage squamous cell carcinoma of the esophagus: a study of the eastern cooperative oncology group 11Other participating institutions: Albany Medical College, Albany, NY (CA 06594); Albert Einstein College of Medicine, Bronx, NY (CA 14958); University of California-Irvine, Orange, CA; Case Western Reserve University, Cleveland, OH (CA 14548); Chicago Medical School, Chicago, IL (CA 14144); Colorado Cancer Research Program, Denver, CO; Downstate Medical Center, Brooklyn, NY; University of Florida-Gainesville, Gainesville, FL; Fox Chase Cancer Center, Philadelphia, PA (CA 18281); Indiana University Medical Center, Indianapolis, IN (CA 49883); Medical College of Ohio, Toledo, OH; University of Medicine and Dentistry of New Jersey, Newark, NJ; University of Minnesota, Minneapolis, MN (CA 20365); New York University Medical Center, New York, NY (CA 16395); Newark Beth Israel Medical Center, Newark, NJ; Rush-Presbyterian-St. Luke’s Medical Center, Chicago, IL (CA 25988); University of Pretoria, Pretoria, South Africa (CA 21692); Natalie Warren Bryant Cancer Center, Tulsa, OK; Vermont Regional Cancer Center, Burlington, VT.