since 2 years ago, what are the top three most frequent microbiology tests ordered for patients within the same month after receiving the endosc remove bile stone?
select t3.spec_type_desc from ( select t2.spec_type_desc, dense_rank() over ( order by count(*) desc ) as c1 from ( select admissions.subject_id, procedures_icd.charttime 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 = 'endosc remove bile stone' ) and datetime(procedures_icd.charttime) >= datetime(current_time,'-2 year') ) as t1 join ( select admissions.subject_id, microbiologyevents.spec_type_desc, microbiologyevents.charttime from microbiologyevents join admissions on microbiologyevents.hadm_id = admissions.hadm_id where datetime(microbiologyevents.charttime) >= datetime(current_time,'-2 year') ) as t2 on t1.subject_id = t2.subject_id where t1.charttime < t2.charttime and datetime(t1.charttime,'start of month') = datetime(t2.charttime,'start of month') group by t2.spec_type_desc ) as t3 where t3.c1 <= 3