“…No previous studies contained sufficient methodological detail to help us, nor did they report reliability studies [12, 13], but they were encouraging in providing rich clinical data [12, 13, 14, 15, 16]. Health services research includes medical chart review in, for example, quality of care, risk adjustment, and health care delivery and utilization work [17, 18, 19, 20, 21, 22, 23], and we took advantage of these experiences in developing our methodology.…”