Network study of responses to unusualness and psychological stress during the COVID-19 outbreak in Korea. - Ryu, Seunghyong; Park, In-Hoo; Kim, Mina; Lee, Yu-Ri; Lee, Jonghun; Kim, Honey; Jhon, Min; Kim, Ju-Wan; Lee, Ju-Yeon; Kim, Jae-Min; Kim, Sung-Wan (PLoS ONE, 2021)