depreciation_interest   A function to calculate the costs of medical
                        equipment
df_cpi_combined         Consumer Price Index (CPI) data from CBS
df_fp                   Job vacancy data from CBS
df_ppp                  Purchasing Power Parity (PPP) data from OECD
df_rp_medical           Medical unit cost data from the Costing manual:
                        Methods and Reference Prices for Economic
                        Evaluations in Healthcare
df_rp_patient           Patient & family unit cost data from the
                        Costing manual: Methods and Reference Prices
                        for Economic Evaluations in Healthcare
df_rp_prod              Productivity & other unit cost data from the
                        Costing manual: Methods and Reference Prices
                        for Economic Evaluations in Healthcare
discount_value          A function to calculate the discounted value of
                        future costs or effects
discount_vector         A function to create a discount vector for a
                        given time period
friction_period         A function to download the friction period over
                        one or multiple years
nl_med_prices           A function to download the Medical Reference
                        prices of the Dutch Costing Manual for one or
                        multiple years
nl_pat_fam_prices       A function to download the Patient & Family
                        Reference prices of the Dutch Costing Manual
                        for one or multiple years
nl_ppp                  A function to obtain the Dutch PPP factor
                        values in International Dollar (INT$)
nl_price_index          A function to calculate the Consumer Price
                        Index (CPI) for a given year range.
nl_prod_oth_prices      A function to download the Productivity and
                        other societal Reference prices of the Dutch
                        Costing Manual for one or multiple years
pretty_price            A function to write pretty prices in 'bookdown'
                        reports
