U.S. Contract Research Organization (CRO) Services Market Size, Share & COVID-19 Impact Analysis, By Service Type (Early Phase Development Services (Chemistry, Manufacturing, and Controls (CMC), Preclinical Service, and Discovery), Clinical (Phase 1, Phase 2, Phase 3, and Phase 4), Laboratory Services, and Others), By Application (Oncology, Neurology, Cardiology, Infectious Disease, Metabolic Disorder, Renal/Nephrology, and Others), By End Usuario (compañías farmacéuticas y de biotecnología, compañías de dispositivos médicos, institutos académicos y de investigación, y otros), y pronóstico