What role can health policy and systems research play in supporting responses to COVID-19 that strengthen socially just health systems?. Issue 9 (6th October 2020) - Gilson, Lucy; Marchal, Bruno; Ayepong, Irene; Barasa, Edwine; Dossou, Jean-Paul; George, Asha; Guinaran, Ryan; Maceira, Daniel; Molyneux, Sassy; Prashanth, N S; Schneider, Helen; Shawar, Yusra; et al.