Ключевые слова: ache, acid, anatomy, biology, cartoon, charity, clinic, day, design, diet, digestion, digestive, disease, donate, donation, donor, flat, food, gastric, give, hand, health, healthy, heartburn, help, hospital, human, illness, illustration, internal, life, medical, medicine, national, organ, pain, patient, people, poster, reflux, save, science, stomach, surgery, system, transfusion, volunteer, wide, world,