Critically describe a diagnostic test of relevance to gastrointestinal and stress: Colonoscopy

1. Critically describe a diagnostic test of relevance to gastrointestinal and stress: Colonoscopy 2. Why is it relevant? What conditions? What are it limitations? 3. Use the literature ( latest articles: 2015-2019) to support your topic. 4. Critically analyse from the literature 5. Need good citations