The technology is transparent, likely with low running costs and wide-area effectiveness, once baseline infrastructure is in place across devices, communications, and trained people.

FORBES: How Virtual Health Assistants Can Reshape Healthcare

This gave an effectiveness of 17%, which is so low as to be statistically non-significant.

BBC: Tuberculosis vaccine hopes dashed

Although camps are a low-cost option, the poor outcomes reduced cost-effectiveness.

BBC: India cataract policy 'needs review'

The government must ensure that cost effectiveness is at the heart of its approach to securing investment in new low carbon energy.

BBC: UK CO2 emissions rising, government advisers warn