Doubt at the core: Unspoken vaccine hesitancy among healthcare workers - Leonardo W. Heyerdahl; Stef Dielen; ToTran Nguyen; Carla Van Riet; Tarun Kattumana; Clarissa Simas; Nico Vandaele; Anne-Mieke Vandamme; Corinne Vandermeulen; Tamara Giles-Vernick; Heidi Larson; Koen Peeters Grietens; et al. (Elsevier, 2022)