title: Air-travel study struggles to get airborne.
authors: Declan
authors: D
authors: Butler
mesh_terms: D005381:Financing, Organized / Q000191:economics; D006801:Humans; D012106:Research / Q000191:economics*; D012307:Risk Factors; D014195:Travel / Q000706:statistics & numerical data; D020246:Venous Thrombosis / Q000209:etiology*; D014944:World Health Organization