Department of Medical Oncology;
the Christie NHS Foundation Trust;
the University of Manchester;
Department of Biostatistics;
the Christie NHS Foundation Trust;
Department of Quality and Standards;
the Christie NHS Foundation Trust;
Thrombo-embolism; Deep venous thrombosis; Pulmonary embolism; Colorectal cancer; Oesophageal cancer; Gastro-oesophageal cancer;