Major complications and side-effects of the treatment were severe chest pain ( @ -LSB- @ % -RSB- of @ patients in the irradiation group vs @ -LSB- @ % -RSB- of @ patents in the control group ) , fistula formation ( six -LSB- @ % -RSB- vs five -LSB- @ % -RSB- ) , aspiration pneumonia ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ) , haemorrhage ( five -LSB- @ % -RSB- vs five -LSB- @ % -RSB- ) , and recurrent dysphagia ( @ -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ) .