Germany-based health care group Fresenius SE&Co. KGaA is set to post robust operating results and leverage (debt to EBITDA) of less than 3.5x at year-end 2017. The group's three main business units announced significant acquisitions in the past 18 months, but we still expect net debt to EBITDA at about 3.5x in both 2017 and 2018. We are revising our outlook on the Fresenius group to positive from stable and affirming our 'BBB-' rating. The positive outlook reflects the possibility that we could upgrade the group within 12 to 18 months, if we see further evidence that its external growth policy is consistent with S&P Global Ratings-adjusted leverage of about 3.5x. PARIS (S&P Global Ratings) Dec. 27, 2017--S&P