1. Norwegian InstituteOfPublic Health.2020https://www.fhi.no/nyheter/2020/rad‐til‐reisende‐i‐nye‐omrader‐med‐lokal‐smittespredning‐av‐covid‐19/(accessed March 8 2020).
2. World Health Organization.2020ahttps://www.who.int/dg/speeches/detail/who‐director‐general‐s‐remarks‐at‐the‐media‐briefing‐on‐2019‐ncov‐on‐11‐february‐2020(accessed March 8 2020).
3. World Health Organization.2020bhttps://www.who.int/news‐room/articles‐detail/key‐considerations‐for‐repatriation‐and‐quarantine‐of‐travellers‐in‐relation‐to‐the‐outbreak‐of‐novel‐coronavirus‐2019‐ncov/(accessed March 9 2020).
4. Characteristics of and Important Lessons From the Coronavirus Disease 2019 (COVID-19) Outbreak in China