Prevalence of hepatitis D virus infection in sub-Saharan Africa: a systematic review and meta-analysis oleh Alexander J Stockdale, MRes, Mas Chaponda, PhD, Apostolos Beloukas, PhD, Richard Odame Phillips, PhD, Philippa C Matthews, PhD, Athanasios Papadimitropoulos, MSc, Simon King, PhD, Laura Bonnett, PhD, Prof Anna Maria Geretti, PhD