00294pam a2200121 a 4500020001700000041000500017082001300022100000900035245008900044250001400133260001700147300000800164  a9241545980c  h  a614bWHO  aWho.  aTuberculosis and air travel Guidelines for Prefention and ControlhTextual Documents  a2nd ed. .  bW.H.O.c2006  a33.