Editorial: Fifty Campbell systematic reviews relevant to the policy response to COVID‐19 by Ariel Aloe, Eric Barends, Douglas Besharov, Zulfiqar Bhutta, Xinsheng ‘Cindy’ Cai, Marie Gaarder, Ruth Garside, Neal Haddaway, Elizabeth Kristjansson, Brandy Maynard, Lorraine Mazerolle, Robyn Mildon, Sarah Miller, Jan Minx, Peter Neyroud, Annette O'Connor, Denise Rousseau, Ashrita Saran, Joann Starks, Gavin Stewart, Jo Thompson Coon, Peter Tugwell, Jeffrey Valentine, Vivian Welch, Oliver Wendt, Howard White

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