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Table 1 Selection criteria for including studies

From: Symptoms of gastroesophageal reflux disease in severely mentally retarded people: a systematic review

Types of studies:
   - empirical studies with a minimal sample size of five subjects
   - published from 1990 on.
Types of participants:
   - subjects are mentally retarded or have a neurological disorder1;
   - subjects are at least two years of age.
Types of symptoms:
   - all types of observable symptoms that are related to the results of a valid reference test for diagnosing GERD, such as PH-measurement, gastrointestinal endoscopy, radiologic method for the detection of gastroesophageal reflux.
  1. 1 People with a serious neurological impairment such as cerebral palsy are often mentally retarded.