Creating the vaccination improvement potential index.

Background: Numerous social and behavioral factors have been implicated in vaccination coverage. There is no single measure that describes a country's ability to improve or maintain its immunization coverage.

Methods: We estimated the "Vaccination Improvement Potential" (VIP) by taking the geometric mean of 13 different indicators on health financing, vaccine confidence, and socio-demographics for more than 200 countries across 30 years.

Through-space (19)F-(19)F spin-spin coupling in ortho-fluoro Z-azobenzene.

We report through-space (TS) (19)F-(19)F coupling for ortho-fluoro-substituted Z-azobenzenes. The magnitude of the TS-coupling constant ((TS) JFF ) ranged from 2.2-5.