RT Journal Article SR Electronic T1 Early warning of epidemics: towards a national intelligent syndromic surveillance system (NISSS) in China JF BMJ Global Health JO BMJ Global Health FD BMJ Publishing Group Ltd SP e002925 DO 10.1136/bmjgh-2020-002925 VO 5 IS 10 A1 Peng Jia A1 Shujuan Yang YR 2020 UL http://gh.bmj.com/content/5/10/e002925.abstract AB