Final answer:
The provided information doesn't directly reference Stroebe and colleagues' 2013 study, but in health psychology, the costs of suppressing grief typically include psychological and physical effects, measured through various methods such as questionnaires or interviews.
Step-by-step explanation:
The question is asking how Stroebe and colleagues, in their 2013 study, assessed the costs of suppressing grief for the benefit of a partner. However, the references provided do not directly relate to Stroebe and colleagues' study in 2013. Nevertheless, in the context of health psychology, the assessment of the costs of holding in grief for the sake of a partner's well-being would likely involve a consideration of the psychological and possibly physical effects of such an action. This would include measuring indicators such as stress levels, psychological wellbeing, and the quality of interpersonal relationships, to understand the impact of such behavior on an individual's health. Such assessment could be done using self-report questionnaires, clinical interviews, or physiological measures, although specifics would require access to the actual research conducted by Stroebe et al.