Copenhagen Airport (Kastrup) you can take the train to the
city (12 min to Main Station). Change to bus 10 (departing from the bridge across the tracks)
or take the S-train to Nørreport Station, from there take bus 184, 185, 42, 10 or 150S to
the Panum Institute, Nørre Alle Entrance. Note, that the airport trains with destination
"Helsingør" continues to Nørreport Station. Taxi from the airport is rather
expensive (~200 DKK).
Reaching WJC by train
From Copenhagen Main Station (Hovedbanegården). see above.
Collection of maps that can be useful for finding the Panum institute and the WJC buildings