LIDIA KELLY AUSTRALIA is sticking to plans to start re-opening to the rest of the world only from the middle of next year, officials said on yesterday, resisting mounting pressure to end the closure of international borders. In March 2020, Australia closed its borders to non-nationals and non-residents and has since been allowing only limited international arrivals, mainly citizens returning from abroad. "All the way through we will be guided by the medical advice," Prime Minister Scott Morrison said at a televised briefing. "We will be guided by the economic advice." Earlier in the day, Treasurer Josh Frydenberg told the…