(Reuters) - The 71 badly decomposed bodies found in the back of an abandoned truck in Austria last month have been released for burial, the institution that carried out autopsies on the corpses said on Friday. The discovery of the remains, presumed to be those of refugees who had to rely on people-smugglers to help them cross the border between Austria and Hungary, caused widespread shock and drew attention to the conditions in which many have fled conflict and poverty in the Middle East, Africa and elsewhere. Days after they were found, Austria and Germany threw open their borders to tens of thousands of people making their way north across Europe via Greece and the Balkans.