Greenbrook TMS (NASDAQ:GBNH – Get Rating) was upgraded by Zacks Investment Research from a “sell” rating to a “hold” rating in a note issued to investors on Monday, Zacks.com reports. According to Zacks, “Greenbrook TMS Inc. is a provider of Transcranial Magnetic Stimulation therapy, an FDA-cleared, non-invasive therapy for the treatment of Major Depressive Disorder ...