NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded to 'A+' from 'A' the rating on the following bonds issued by the Miami-Dade County Health Facilities Authority (MCHFA) on behalf of Nicklaus Children's Hospital (NCH), formerly known as Miami Children's Hospital: --$104.4 million fixed rate bonds, series 2013; --$25.6 million fixed rate bonds, series 2011; --$40.7 million fixed rate bonds, series 2010A; --$63.2 million privately placed indexed floating rate bonds, series 2010B. The Rating Ou