ZURICH, Oct 28 (Reuters) - Switzerland on Wednesday tightened nationwide restrictions to contain the country’s rising wave of COVID-19 cases, ordering dance clubs to be closed from Thursday, halting in-person university classes starting early next month, and placing new limits on sporting and leisure activities. The duration of the new measures, which include the requirement to wear masks in all offices and secondary schools as well as outdoors where social distancing is difficult, is indefinite, the government in Bern said. (Reporting by John Miller and John Revill, editing by Michael Shields)