Create a clean hand-drawn study notes diagram about "pediatric " for "gastroenteritis ". Use neat but slightly messy student handwriting on lined notebook paper. Write in clear, well-structured English with headings and bullet points. Highlight key terms using a yellow highlighter. Draw red circles around important concepts and formulas. Add simple doodles, arrows, and icons to visually explain the ideas. Make it look like aesthetic, high-quality revision notes for students. A4 printable size, high resolution,