Table 1 Search strategy

1 Intellectual Disability

2 Mentally Disabled Persons

3 Developmental Disabilities

4 Down Syndrome

5 Developmental disorder*

6 Mental deficien*

7 Mental retard*

8 Down’s syndrome

9 Trisomy 21

10 (1 OR 2 OR 3 OR 4 OR 5 OR 6 OR 7 OR 8 OR 9) (Google Scholar: 1 OR 2 OR 3 OR 4 OR 5 OR 6 OR 7)

19 (NOT) Pregnancy

11 Quality Indicators, Health Care

12 Quality Improvement

13 Total Quality Management

14 Benchmarking

15 Clinical indicator*

16 Quality measure*

17 Quality assessment*

18 (11 OR 12 OR 13 OR 14 OR 15 OR 16 OR 17) (Google Scholar: 11 OR 16)