Ámbito geográfico
UNITED STATES
21
ESTADOS UNIDOS
9
EUROPE
6
EUROPA
4
ARGENTINA
3
JAPON
3
AMERICA LATINA
2
CANADA
2
DEVELOPING COUNTRIES
2
LATIN AMERICA
2
MEXICO
2
RUSIA
2
AMÉRICA LATINA
1
ASIA, CENTRAL
1
ASIA, SOUTHEASTERN
1
BRASIL
1
CENTRAL AMERICA
1
CHINA
1
EUROPEAN UNION COUNTRIES
1
FORMER SOVIET REPUBLICS
1
IRLANDA
1
ISRAEL
1
REINO UNIDO
1
RUSSIA (FEDERATION)
1
SOVIET UNION
1
SPAIN
1
SWEDEN
1
URSS
1
YUGOSLAVIA
1