Erik Waaler
... that Erik Waaler discovered the rheumatoid factor?
... that <b id="mwCVw"><a href="./Erik_Waaler" id="mwCV0" rel="mw:WikiLink" title="Erik Waaler">Erik Waaler</a></b> discovered the <a href="./Rheumatoid_factor" id="mwCV4" rel="mw:WikiLink" title="Rheumatoid factor">rheumatoid factor</a>?