Skilgreining

sjá t.d. hér: http://www.landspitali.is/library/Sameiginlegar-skrar/Gagnasafn/Stodsvid/Fjarmalasvid/utbod-og-verdfyrirspurnir/2013/Ver%C3%B0fyrirspurn_Litasprautur,%20sl%C3%B6ngur%20%C3%AD%20meltingarveg%20o.fl._%C3%A1g%C3%BAst%202013.pdf