RT Journal Article SR Electronic T1 What kind of evidence do we need to strengthen primary healthcare in the 21st century? JF BMJ Global Health JO BMJ Global Health FD BMJ Publishing Group Ltd SP e001668 DO 10.1136/bmjgh-2019-001668 VO 4 IS Suppl 8 A1 Lisa R Hirschhorn A1 Etienne V Langlois A1 Asaf Bitton A1 Abdul Ghaffar YR 2019 UL http://gh.bmj.com/content/4/Suppl_8/e001668.abstract AB