STS Hospital-level stroke surveillance in Lilongwe, Malawi: providing tools for evaluating interventions in hypertension and stroke in sub-Saharan Africa Lilongwe
If Q 5.10 (numsymp):If Q 5.9( Headache )=No, how many times have they had these symptoms?= Once, Twice or 3 times or more , when was the most recent previous event of these symptoms?