Correction: Stakeholders' views and experiences of care and interventions for addressing frailty and pre-frailty: A meta-synthesis of qualitative evidence - D’Avanzo, Barbara; Shaw, Rachel; Riva, Silvia; Apostolo, Joao; Bobrowicz-Campos, Elzbieta; Kurpas, Donata; Bujnowska-Fedak, Maria; Holland, Carol (PloS one, 2018)