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:

Pilot comparison between potassium titanyl phosphate laser and bipolar radiofrequency in paediatric tonsillectomy . OBJECTIVES To compare the advantages and disadvantages of potassium titanyl phosphate laser with those of bipolar radiofrequency techniques , in paediatric tonsillectomy . STUDY DESIGN Prospective , randomised , clinical study . PATIENTS AND METHODS From July 2004 to April 2006 , 80 patients aged between 10 and 15 years , with tonsillectomy planned for chronic tonsillitis , were included in the study . Children were prospectively randomised into two equal groups : potassium titanyl phosphate laser tonsillectomy and bipolar radiofrequency tonsillectomy . Operative time and intra-operative blood loss were recorded . Patients were scheduled for follow up during the first , second and fourth post-operative weeks . They were asked to record their pain and discomfort on a standardised visual analogue scale , from zero ( no pain ) to 10 ( severe pain ) . Post-operative complications were also recorded and managed . RESULTS The potassium titanyl phosphate laser group showed a slightly longer operative time ( mean 12 minutes ) than the bipolar radiofrequency group ( mean 10 minutes ) . Intra-operative blood loss was significantly less in the potassium titanyl phosphate laser group ( mean 21 cm3 ) than in the bipolar radiofrequency group ( mean 30 cm3 ) . In the first week , post-operative pain scores were less in the potassium titanyl phosphate laser group than in the bipolar radiofrequency group ( means 7.5 and 8.5 , respectively ) . However , in the second week pain scores increased more in the potassium titanyl phosphate laser group than in the bipolar radiofrequency group ( means 8.5 and 6 , respectively ) . In the fourth week , both groups showed equal and nearly normal pain scores . No case of reactionary post-tonsillectomy haemorrhage was recorded in either group . Only one case of secondary post-tonsillectomy haemorrhage was recorded , in the potassium titanyl phosphate laser group ( 2.5 per cent ) , managed conservatively . CONCLUSION Both the potassium titanyl phosphate and the bipolar radiofrequency techniques were safe and easy to use for tonsillectomy , with reduced operative time , blood loss and complication rates and better post-operative general patient condition . Potassium titanyl phosphate laser resulted in reduced operative bleeding and immediate post-operative pain , compared with the bipolar radiofrequency technique . However , potassium titanyl phosphate laser required slightly more operative time and caused more late post-operative pain than the bipolar radiofrequency technique . The low rate of recorded complications showed that both techniques cause little damage to the tonsillar bed during dissection , thus minimising complications .
{"Intervention": ["tonsillectomy", "potassium titanyl phosphate laser", "Potassium titanyl phosphate laser", "bipolar radiofrequency techniques", "bipolar radiofrequency", "potassium titanyl phosphate"], "Outcome": ["reactionary post-tonsillectomy haemorrhage", "blood loss", "complication rates", "safe", "longer operative time", "pain scores", "operative time", "easy to use", "Intra-operative blood loss", "post-operative pain scores", "late post-operative pain", "operative bleeding", "immediate post-operative pain", "secondary post-tonsillectomy haemorrhage"], "Participant": ["paediatric tonsillectomy ."]}