VACCELERATE Site Network: Real-time definition of clinical study capacity in Europe. - Salmanton-García J; Wipfler P; Valle-Simón P; Merakou C; Kopsidas I; Bethe U; Steinbach A; Spivak O; Součková L; Mendonça MA; Koniordou M; Hellemans M; et al. (Vaccine, 2023)