RT Journal Article SR Electronic T1 COVID-19, fear and sexual behaviour: a survey in a tertiary STI clinic in Lisbon JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP sextrans-2020-054834 DO 10.1136/sextrans-2020-054834 A1 Ana Luísa João A1 André Lencastre A1 Joana Calvão A1 Ana Rodrigues A1 Cândida Fernandes YR 2021 UL http://sti.bmj.com/content/early/2021/01/03/sextrans-2020-054834.abstract AB