ZURICH - Health problems of the former Soviet president, Mr Mikhail Gorbachev, forced him to cancel another public appearance in Switzerland and will probably land him back in hospital, his environmentalist Green Cross group said yesterday. Mr Gorbachev (66) was unable to attend a benefit dinner for the group, on Thursday. He had earlier left a Berne hospital after two days of tests for what aides described as allergy problems. - (Reuters)