Table 1 Literature search strategy: PubMed, Scopus, Web of Science
From: Cost analysis of chronic obstructive pulmonary disease (COPD): a systematic review
| Database | Search terms | Language | Results |
|---|---|---|---|
| PubMed | “COPD” AND “cost*” AND “economic impact” | English | 35 |
| PubMed | “COPD” AND “cost of illness” AND “burden of disease” | English | 29 |
| PubMed | “COPD” AND “burden of disease” AND “cost*” | English | 12 |
| Scopus | “COPD” AND “cost*” AND “economic impact” | English | 20 |
| Scopus | “COPD” AND “burden of disease” AND “cost*” | English | 19 |
| Scopus | “COPD” AND “cost of illness” | English | 134 |
| Web of Science | “COPD” AND “cost*” AND “economic impact” | English | 44 |
| Web of Science | “COPD” AND “burden of disease” AND “cost*” | English | 13 |
| Web of Science | “COPD” AND “cost of illness” | English | 17 |