since 2101, how many patients were prescribed with calcium acetate within the same hospital visit after having undergone create cutanperiton fist.
select count( distinct t1.subject_id ) from ( select admissions.subject_id, procedures_icd.charttime, admissions.hadm_id 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 = 'create cutanperiton fist' ) and strftime('%y',procedures_icd.charttime) >= '2101' ) as t1 join ( select admissions.subject_id, prescriptions.startdate, admissions.hadm_id from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'calcium acetate' and strftime('%y',prescriptions.startdate) >= '2101' ) as t2 on t1.subject_id = t2.subject_id where t1.charttime < t2.startdate and t1.hadm_id = t2.hadm_id