Tallon, Debbie, Wiles, Nicola, Campbell, John, Chew-Graham, Carolyn, Dickens, Chris, Macleod, Una, Peters, Tim J., Lewis, Glyn, Anderson, Ian M., Gilbody, Simon, Hollingworth, William, Davies, Simon, Kessler, David, "Mirtazapine added to selective serotonin reuptake inhibitors for treatment-resistant depression in primary care (MIR trial): study protocol for a randomised controlled trial", Trials, 2016