Implementation research on noncommunicable disease prevention and control interventions in low- and middle-income countries: A systematic review.

(Indeed, you begin the conclusion by stating that "High quality implementation science can play a key role in informing effective delivery of health system interventions", yet your study only quantifies the number of studies, not their quality.) Limitations should also, importantly, discuss the fact that there may be significant implementation research conducted which is never published which may introduce important selection bias in your study.

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