Correction to: Pattern of dental needs and advice on Twitter during the COVID-19 pandemic in Saudi Arabia - Khalifa S. Al-Khalifa; Eman Bakhurji; Hassan S. Halawany; Esraa M. Alabdurubalnabi; Wejdan W. Nasser; Ashwin C. Shetty; Shazia Sadaf (BMC, 2021)