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:

p16 ( INK4a ) Expression does not predict the outcome of cervical intraepithelial neoplasia grade 2 . Spontaneous regression of cervical intraepithelial neoplasia grade 2 ( CIN2 ) lesions has been recognized since 1955 , but predictors of this are poorly understood . Among the predictive markers studied , p16 ( INK4a ) has been suggested to be of some value in monitoring the diagnosis of CIN2 . In this clinical trial , 90 Brazilian women , diagnosed to CIN2 and high-risk human papillomavirus infection , were randomized into two groups of equal size : 45 women whose lesions were excised and 45 women subjected to prospective follow-up at 3-month intervals at least for 1 year ( mean 6.8 months ) . p16 ( INK4a ) expression was analyzed in paraffin-embedded sections using immunohistochemical staining . Among the 45 women in the follow-up group , 42 % experienced spontaneous regression , 11 % showed persistence , 22 % progressed to CIN3 , and 20 % had partial regression to CIN1 or ASCUS ( atypical squamous cell undetermined signifiance ) . p16 ( INK4a ) expression was detected in 68.9 % of the patients . In univariate survival ( Cox ) analysis , no significant difference in regression was obtained between p16 ( INK4a ) -negative and -positive CIN2 lesions ( adjusted HR = 1.1 ; 95 % CI 0.6-2.0 ) . In conclusion , p16 ( INK4a ) expression could be useful in the diagnosis of CIN2 . However , it failed to predict the outcome of CIN2 . Because of its high spontaneous regression rate , follow-up could be considered as a management option of CIN2 in young and compliant women .
{"Intervention": ["lesions were excised", "prospective follow-up", "immunohistochemical staining", "p16 ( INK4a )", "p16 ( INK4a ) Expression", "and -positive", "p16 ( INK4a ) -negative"], "Outcome": ["CIN2", "p16 ( INK4a ) Expression", "p16 ( INK4a ) expression", "diagnosis of CIN2", "univariate survival ( Cox ) analysis"], "Participant": ["90 Brazilian women , diagnosed to CIN2 and high-risk human papillomavirus infection , were randomized into two groups of equal size : 45 women whose lesions were excised and 45 women subjected to prospective follow-up at 3-month intervals at least for 1 year ( mean 6.8 months ) .", "45 women"]}