Committing to implementation research for health systems to manage and control non-communicable diseases. Issue 2 (February 2021) - Marten, Robert; Mikkelsen, Bente; Shao, Ruitai; Dal Zennaro, Livia; Berdzuli, Nino; Fernando, Thushara; Hammerich, Asmus; Hennis, Anselm; Shin, Hai-rim; Shongwe, Steven; Ghaffar, Abdul