3.1 Guideline Selection
After screening for relevance in databases, 471 records were initially
identified and 43 records were excluded for duplicates. After screening
the title and abstract of records, 375 records were excluded because
they were about animals, sanitary technical guidance or irrelevant. 53
remaining records were retrieved for full text and 33 records were
excluded because they were guidance documents on health work. Finally,
20 CPGs were selected (Figure 1 ). Table 1 presented
the basic information of the included guidelines,