1 Subjects: “...Contraceptives, Postcoital / economics...”

2 Subjects: “...Contraceptives, Postcoital / economics...”

3 Subjects: “...Pulmonary Surfactants / economics...”

4 Subjects: “...Influenza Vaccines / economics...”

5 Subjects: “...Influenza Vaccines / economics...”

6 “... controlled trials, four observational studies, and one economic evaluation. The evidence indicated fish oil...”

7 “... controlled trials, four observational studies, and one economic evaluation. The evidence indicated fish oil...”