Her publications all seem to be under the surname single Cornelissen as of 2015

Circadian cardiology with focus on both prevention and intervention, 2015: t.p. (Germaine Cornelissen) p. [xi] (Germaine Cornelissen, PhD, FICC; Halberg Chronobiology Center, University of Minnesota Medical School, Minneapolis, US)

Univ. of Minnesota website, 26 June 2015: staff (Germaine Cornelissen-Guilaume, Ph.D.; professor)

Halberg Chronobiology Center website, 26 June 2015: director (Germaine Cornelissen; director, Halberg Chronobiology Center, 2013 to present; professor, Department of Integrative Biology and Physiology, University of Minnesota, 2006 to present) cv (Germaine Gabrielle Cornélissen Guillaume; PhD, University of Brussels, 1976; lists full career details and publications)