Measuring engagement in HIV care: Measurement invariance in three racial/ethnic patient groups

John A. Sauceda, Nadra E. Lisha, Samantha E. Dilworth, Mallory O. Johnson, Katerina A. Christopoulos, Troy Wood, Kimberly A. Koester, W. Christopher Mathews, Richard D. Moore, Sonia Napravnik, Kenneth H. Mayer, Heidi M. Crane, Rob J. Fredericksen, Michael J. Mugavero, Torsten B. Neilands