I should add that I'm using newtxmath because:
http://ctan.math.washington.edu/tex-archive/macros/latex/contrib/IEEEtran/IEEEtran_HOWTO.pdf says: 1) Comsoc Mode: Comsoc mode only affects the math font so that it will more closely match the Times Roman main text. Either Michael Sharpe’s freely available newtxmath package [8] (version 1.451, July 28, 2015 or later is recommended) or the commercial MathTime [9] math fonts (as mtpro2.sty, mt11p.sty or mathtime.sty) are acceptable. Under comsoc mode, if one of these packages has not been loaded by the user at the start of the document, IEEEtran will attempt to enforce their use based on what is available on the system. The recommended loading procedure and order for newtxmath is: \usepackage[T1]{fontenc} % optional \usepackage{amsmath} \usepackage[cmintegrals]{newtxmath} \usepackage{bm} % optional
