As it flagged up in the summer, SGX-listed orthopaedic specialists Asian Healthcare Specialists (AHS) is to take a 51% stake in medical group Cornerstone Asia Health for S$32m (US$23.5m). Cornerstones provides multidisciplinary healthcare services across different specialisations, offering key services in ophthalmology, urology, dermatology and gastroenterology as well as family medicine. AHS will pay S$5m…