Corona children studies "Co-Ki": First results of a Germany-wide registry
on mouth and nose covering (mask) in children
Silke Schwarz University of Witten/Herdecke
Ekkehart Jenetzky University of Witten/Herdecke
Hanno Krafft University of Witten/Herdecke https://orcid.org/0000-0002-8199-8874
Tobias Maurer University of Witten/Herdecke
David Martin ( David.Martin@uni-wh.de ) University of Witten/Herdecke
