What kind of evidence do we need to strengthen primary healthcare in the 21st century?

The increased recognition of the critical importance of quality primary healthcare (PHC) to achieve effective universal health coverage (UHC) and contribute to the sustainable development goals (SDGs) has reignited global interest in strengthening PHC systems and delivery.1 However, this focus has also highlighted the implementation gaps between evidence-informed interventions and their delivery to all people everywhere. These gaps include how...