After an on-again, off-again relationship of more than 1-1/2 years, University Hospital's partnership with KentuckyOne Health becomes official Friday. But amid planned internal celebrations with cake and balloons, concerns linger over employment issues and the separation of Louisville's only public hospital into two separately managed parts. Hospital officials say their alliance will pump $1.4 billion into University of Louisville health operations over 20 years and improve the health of Kentucky.