​Differential diagnosis of causes of gastro esophageal reflux disease

​Differential diagnosis of causes of gastroesophageal reflux disease
-delayed gastric emptying 
-gastroparesis 
-impaired salivation 
-Sjogren syndrome 
-anticholinergic radiation 
-abnormal acid clearance due to scleroderma 
-hiatal hernia 
-relaxation or incompetence of lower esophageal sphincter