Age- and sex-specific upper reference limits for cardiac biomarkers in Chinese children and adolescents: a prospective study – Nature.com

Write a detailed and engaging article about Age- and sex-specific upper reference limits for cardiac biomarkers in Chinese children and adolescents: a prospective study  Nature.com. The article should be structured with clear distinct paragraphs, each focusing on a specific aspect of the topic. Keep the tone human and conversational while ensuring the content is informative, well-organized, and easy to read. avoid adding a conclusion; focus purely on delivering structured, insightful information.