... provider, and that history, exam ,and differential diagnosis are central to the provision ofportal -of- entry primary care as well as secondary specialtycare. They noted that diagnostic uncertainty, complexity ,and ... no easy answers, especially giventhe inherent high-risk, uncertainty, and complexity ofchest pain diagnosis, and the possibility that chest painmay present with any mix of multiple musculoskeletal ... theproviders, and that the nature of the referral (e.g., amountand type of information accompanying the referral) maydepend on the nature of the condition, whether the refer-ral is for reasons of diagnosis...