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:

The use of a water extract from the bark of Choerospondias axillaris in the treatment of second degree burns . Burns are common in Vietnam , and because of economic constraints and limited resources for the import of appropriate treatments , the health authorities are obliged to rely on traditional herbal remedies . It is therefore essential to evaluate current drugs , one of which is the water extract of the bark of the tree Choerospondias axillaris . It has been used for many years in the Vietnam-Sweden hospital at Uong Bi in northern Vietnam . We assessed the efficacy of the remedy in an open , randomised controlled clinical trial , in which 20 patients with second degree burns were treated with the extract of the Choerospondias axillaris and 19 with saline gauze . The mean healing time was significantly shorter for patients treated with Choerospondias axillaris ( 11 days ) compared with patients treated with saline gauze ( 17 days ) ( p < 0.01 ) , and the number of wound infections was significantly lower in the Choerospondias axillaris group ( 7/20 compared with 16/19 , p = 0.003 ) . The bark extract was easy to apply and additional wound care was not usually necessary , while the treatment with saline gauze was laborious for both patients and staff and was much more expensive . The extract from Choerospondias axillaris is a convenient treatment for second degree burns in both children and adults .
{"Intervention": ["extract of the Choerospondias axillaris", "extract from Choerospondias axillaris", ".", "bark extract", "water extract of the bark of the tree Choerospondias axillaris", "saline gauze .", "saline gauze", "Choerospondias axillaris", "water extract from the bark of Choerospondias axillaris"], "Outcome": ["expensive", "number of wound infections", "efficacy", "mean healing time"], "Participant": ["treatment of second degree burns .", "20", "children", "19", "adults"]}