An App-Based Digit Symbol Substitution Test for Assessment of Cognitive Deficits in Adults With Major Depressive Disorder: Evaluation Study oleh Roger S McIntyre, Orly Lipsitz, Nelson B Rodrigues, Mehala Subramaniapillai, Flora Nasri, Yena Lee, Ben Fehnert, James King, Lambros Chrones, Kevin Kratiuk, Sharif Uddin, Joshua D Rosenblat, Rodrigo B Mansur, Maggie McCue