Correction to: Assessing the prevalence of young children living in households prepared for COVID-19 in 56 low- and middle-income countries - Chunling Lu; Yiqun Luan; Sara N. Naicker; S. V. Subramanian; Jere R. Behrman; Jody Heymann; Alan Stein; Linda M. Richter (BMC, 2022)