Total number of papers by country. Countries: Australia (AU) Austria (AT) Belgium (BE) Brazil (BR) Canada (CA) China (CN) Denmark (DK) Finland (FI) France (FR) Germany (DE) Greece (GR) India (IN) Iran (IR) Israel (IL) Italy (IT) Japan (JP) Mexico (MX) Netherlands (NL) Norway (NO) Poland (PL) Portugal (PT) Russia (RU) South Korea (KR) Spain (ES) Sweden (SE) Switzerland (CH) Taiwan (TW) Turkey (TR) United Kingdom (UK) United States (US).