COVID-19(55) harm reduction(40) pandemic(39) Result(39) COVID-19 pandemic(35) reduction(34) Health(30) drug(30) Treatment(27) conducted(25) Substance use(24) risk(24) Care(21) affected(20) drugs(20) Analysis(19) alcohol(18) participant(18) reported(18) Community(17) injection(17) individual(17) Support(16) lockdown(16) response(16) reduce(15) Intervention(15) People who inject drugs(15) overdose(14) changes in(14)