JAPAN : Japanese Prime Minister Shinzo Abe underwent a medical check-up in hospital on Monday, a government source said, amid concern voiced by a top official that the premier was suffering from fatigue from handling the coronavirus pandemic.Abe, Japan's longest-serving prime minister, left hospital after the examination, Jiji news agency said.He had the check-up at Tokyo's Keio University Hospital, the source familiar with the situation told Reuters.Health Minister Katsunobu Kato, a close aide to the premier, said he understood it was a regular check-up and he was "not at all" worried about Abe's health."All I know is from media reports.