Exclusion criteria:
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1. Pregnant women,or women preparing for pregnancy or breastfeeding;
2. Severe heart, brain, and kidney disease, generally poor condition or organ failure;
3. Patients who have been taking drugs that affect constipation for a long time, such as diabetes, hypothyroidism, electrolyte disturbance, and scleroderma;
4. Drugs that cannot affect the gastrointestinal motility / sensory function in the test: such as gastric motility drugs, erythromycin antibiotics, anticholinergics, anesthetic pain agents, antidepressants, calcium channel blockers, diuretics, calcium Agents, iron agents, antidiarrheals, antihistamines, etc.;
5. Took antibiotics or microecological preparations in the last 2 weeks;
6. In the past 6 months, colonoscopy revealed organic intestinal diseases such as intestinal tuberculosis, intestinal obstruction, intestinal tumors, intestinal diverticulum, congenital megacolon, and colonic prolongation (colon polyps <= 3 and Benign lesions with a maximum polyp diameter <= 0.5 cm can be included);
7. With constipation of irritable bowel syndrome.
8. Patients after hysterectomy.
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