A Observational Study to Compare Effectiveness and Safety of the Surgeries in Patients With Esophageal Cancer

Inclusion Criteria: * Pathologically diagnosed middle and lower thoracic IA-IIIB esophageal cancer after surgeries; * Patients who received minimally invasive radical dissections of Ivor-Lewis and Mckeown; * Patients who received tubular gastroesophageal reconstruction; Exclusion Criteria: * Patients complicated with arrhythmia, or serious disfunctions of heart, lung, liver, and kidney before surgeries; * Patients with second primary tumors; * Patients who received abdominal or thoracic surgeries; * Patients who received gastrostomy or nesteostomy before surgeries; * Patients with suspected cervical lymph metastases (in the subgroup of the patients who received the surgery of Mckeown)