You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

A randomized breast-feeding promotion intervention did not reduce child obesity in Belarus . The evidence that breast-feeding protects against obesity is based on observational studies , with potential for confounding and selection bias . This article summarizes a previously published study in which we assessed whether an intervention designed to promote exclusive and prolonged breast-feeding affects children 's height , weight , adiposity , and blood pressure ( BP ) at age 6.5 y . The Promotion of Breastfeeding Intervention Trial ( PROBIT ) is a cluster-randomized trial of a breast-feeding promotion intervention based on the WHO/UNICEF Baby-Friendly Hospital Initiative . A total of 17,046 healthy breast-fed infants were enrolled from 31 Belarussian maternity hospitals and affiliated clinics , of whom 13,889 ( 81.5 % ) were followed up at 6.5 y with duplicate measurements of height , weight , waist circumference , triceps and subscapular skinfold thicknesses , systolic and diastolic BP . Analysis was based on intention to treat , with statistical adjustment for clustering within hospitals/clinics to permit inferences at the individual level . The experimental intervention led to a large increase in exclusive breast-feeding at 3 mo ( 43.3 % vs. 6.4 % , P < 0.001 ) and a significantly higher prevalence of any breast-feeding throughout infancy . No significant intervention effects were observed on height , BMI , adiposity measures , or BP . The breast-feeding promotion intervention resulted in substantial increases in the duration and exclusivity of breast-feeding yet did not reduce measures of adiposity at age 6.5 y . Previous reports of protective effects against obesity may reflect uncontrolled bias caused by confounding and selection .
{"Intervention": ["breast-feeding promotion", "followed up at 6.5 y with duplicate measurements of height , weight , waist circumference , triceps and subscapular skinfold thicknesses , systolic and diastolic BP", "Promotion of Breastfeeding"], "Outcome": ["height , BMI , adiposity measures , or BP .", "exclusive breast-feeding at 3 mo", "increases in the duration and exclusivity of breast-feeding yet did not reduce measures of adiposity"], "Participant": ["17,046", "13,889"]}