RT Journal Article
SR Electronic
T1 Face mask sign
JF Practical Neurology
JO Pract Neurol
FD BMJ Publishing Group Ltd
SP 554
OP 554
DO 10.1136/practneurol-2021-003174
VO 21
IS 6
A1 Nonnekes, Jorik
A1 Nijkrake, Maarten
YR 2021
UL http://pn.bmj.com/content/21/6/554.abstract
AB