The outgoing boss of the managing body of Hong Kong’s public hospitals has admitted staff shortages and long working hours are problems that remained unsolved, but said progress had been made.Dr Leung Pak-yin, who retires next month after spending nine years as the Hospital Authority’s chief executive, also said a review of a now-suspended hospital accreditation programme, which many frontline staff said created extra work, did not come on time.At a time when the city is divided over the…