 Sanford Health once again looking at a potential merger. The company announcing plans to join Marshfield Clinic on Wednesday. The two hospitals say their merger talks are only just beginning, but they're both hopeful. Marshfield and Sanford have tried to merge with other companies in the past. Marshfield then talks to merge with Minnesota-based Essentia Health last year, but that did fall through. Sanford has tried to merge with several other health care providers over the past five years, but has not been successful.