Where the imported goods are medicines, when the customs value of the imported goods is determined in accordance with Article 30(2)(b) of Council Regulation (EEC) No 2913/92 of 12 October 1992 establishing the Community Customs Code and Article 151(4) of Commission Regulation (EEC) No 2454/93 (2) of 2 July 1993 laying down provisions for the implementation of Council Regulation (EEC) No 2913/92 establishing the Community Customs Code, must it be considered that similar goods are those medicines whose active ingredient and the quantity thereof are the same (or similar) or, rather, in order to identify similar goods, must account be taken of market position as well, that is to say, the popularity and demand, of the imported medicine in question and of its producer?