Clinical Trial Investigative Site Network Market Size & Share, By Therapeutic Areas (Oncology, CNS, Pain Management, Endocrine, Cardiology, Others), Phase (Phase I, Phase II, Phase III, Phase IV), End-use (Sponsor, CRO) - Growth Trends, Regional Insights (U.S., Japan, South Korea, UK, Germany), Competitive Positioning, Global Forecast Report 2025-2034