Extract MBS data by series, including relevant footnotes. <br/> (1) All fields are required. <br/>(2) Series codes (each 4 character alphanumeric), use comma separated if more than one. Example: 5001,q201 <br/>(3) Country codes, either use (M49 standard) -comma separated if more than one-, or only 0 (zero) for all available countries.<br/> (4) Years, use 4 digits. <br/> (5) Period values p:{M=monthly, Q=Quarterly, Y=Annual, A=All periods} Get metadata of all countries and other regional associations currently listed in the MBS. Country codes are M49 and names are provided in English language. Get metadata of all statistical series currently listed in the MBS. Series names and other descriptions are in English. Get metadata of the date codes used in MBS. For example M1=January,...M9=September, MA=October,MB=November and MC=December; Q1=1st. quarter, YY=Year etc.