###HUMAN: count the number of patients who have had a remove fb from periton procedure performed two or more times since 2104., ###ASSISTANT: SELECT COUNT(DISTINCT t1.subject_id) FROM (SELECT admissions.subject_id, COUNT(*) AS c1 FROM procedures_icd JOIN admissions ON procedures_icd.hadm_id = admissions.hadm_id WHERE procedures_icd.icd9_code = (SELECT d_icd_procedures.icd9_code FROM d_icd_procedures WHERE d_icd_procedures.short_title = 'remove fb from periton') AND STRFTIME('%y', procedures_icd.charttime) >= '2104' GROUP BY admissions.subject_id) AS t1 WHERE t1.c1 >= 2