Supplementary Table 1: Two letter country codes.

Code / Country/ territory / Code / Country / territory
AF / AFGHANISTAN / LB / LEBANON
AL / ALBANIA / LS / LESOTHO
DZ / ALGERIA / LR / LIBERIA
AS / AMERICAN SAMOA / LY / LIBYAN ARAB JAMAHIRIYA
AD / ANDORRA / LI / LIECHTENSTEIN
AO / ANGOLA / LT / LITHUANIA
AI / ANGUILLA / LU / LUXEMBOURG
AQ / ANTARCTICA / MO / MACAU
AG / ANTIGUA AND BARBUDA / MK / MACEDONIA
AR / ARGENTINA / MG / MADAGASCAR
AM / ARMENIA / MW / MALAWI
AW / ARUBA / MY / MALAYSIA
AU / AUSTRALIA / MV / MALDIVES
AT / AUSTRIA / ML / MALI
AZ / AZERBAIJAN / MT / MALTA
BS / BAHAMAS / MH / MARSHALL ISLANDS
BH / BAHRAIN / MQ / MARTINIQUE
BD / BANGLADESH / MR / MAURITANIA
BB / BARBADOS / MU / MAURITIUS
BY / BELARUS / YT / MAYOTTE
BE / BELGIUM / MX / MEXICO
BZ / BELIZE / FM / MICRONESIA, FEDERATED STATES OF
BJ / BENIN / MD / MOLDOVA, REPUBLIC OF
BM / BERMUDA / MC / MONACO
BT / BHUTAN / MN / MONGOLIA
BO / BOLIVIA / MS / MONTSERRAT
BA / BOSNIA AND HERZEGOWINA / MA / MOROCCO
BW / BOTSWANA / MZ / MOZAMBIQUE
BV / BOUVET ISLAND / MM / MYANMAR (Burma)
BR / BRAZIL / NA / NAMIBIA
IO / BRITISH INDIAN OCEAN TERRITORY / NR / NAURU
BN / BRUNEI DARUSSALAM / NP / NEPAL
BG / BULGARIA / NL / NETHERLANDS
BF / BURKINA FASO / AN / NETHERLANDS ANTILLES
BI / BURUNDI / NC / NEW CALEDONIA
KH / CAMBODIA / NZ / NEW ZEALAND
CM / CAMEROON / NI / NICARAGUA
CA / CANADA / NE / NIGER
CV / CAPE VERDE / NG / NIGERIA
KY / CAYMAN ISLANDS / NU / NIUE
CF / CENTRAL AFRICAN REPUBLIC / NF / NORFOLK ISLAND
TD / CHAD / MP / NORTHERN MARIANA ISLANDS
CL / CHILE / NO / NORWAY
CN / CHINA / OM / OMAN
CX / CHRISTMAS ISLAND / PK / PAKISTAN
CC / COCOS (KEELING) ISLANDS / PW / PALAU
CO / COLOMBIA / PA / PANAMA
KM / COMOROS / PG / PAPUA NEW GUINEA
CG / CONGO / PY / PARAGUAY
CD / CONGO, THE DRC / PE / PERU
CK / COOK ISLANDS / PH / PHILIPPINES
CR / COSTA RICA / PN / PITCAIRN
CI / COTE D'IVOIRE / PL / POLAND
HR / CROATIA (local name: Hrvatska) / PT / PORTUGAL
CU / CUBA / PR / PUERTO RICO
CY / CYPRUS / QA / QATAR
CZ / CZECH REPUBLIC / RE / REUNION
DK / DENMARK / RO / ROMANIA
DJ / DJIBOUTI / RU / RUSSIAN FEDERATION
DM / DOMINICA / RW / RWANDA
DO / DOMINICAN REPUBLIC / KN / SAINT KITTS AND NEVIS
TP / EAST TIMOR / LC / SAINT LUCIA
EC / ECUADOR / VC / SAINT VINCENT AND THE GRENADINES
EG / EGYPT / WS / SAMOA
SV / EL SALVADOR / SM / SAN MARINO
GQ / EQUATORIAL GUINEA / ST / SAO TOME AND PRINCIPE
ER / ERITREA / SA / SAUDI ARABIA
EE / ESTONIA / SN / SENEGAL
ET / ETHIOPIA / SC / SEYCHELLES
FK / FALKLAND ISLANDS (MALVINAS) / SL / SIERRA LEONE
FO / FAROE ISLANDS / SG / SINGAPORE
FJ / FIJI / SK / SLOVAKIA (Slovak Republic)
FI / FINLAND / SI / SLOVENIA
FR / FRANCE / SB / SOLOMON ISLANDS
FX / FRANCE, METROPOLITAN / SO / SOMALIA
GF / FRENCH GUIANA / ZA / SOUTH AFRICA
PF / FRENCH POLYNESIA / GS / SOUTH GEORGIA AND SOUTH S.S.
TF / FRENCH SOUTHERN TERRITORIES / ES / SPAIN
GA / GABON / LK / SRI LANKA
GM / GAMBIA / SH / ST. HELENA
GE / GEORGIA / PM / ST. PIERRE AND MIQUELON
DE / GERMANY / SD / SUDAN
GH / GHANA / SR / SURINAME
GI / GIBRALTAR / SJ / SVALBARD AND JAN MAYEN ISLANDS
GR / GREECE / SZ / SWAZILAND
GL / GREENLAND / SE / SWEDEN
GD / GRENADA / CH / SWITZERLAND
GP / GUADELOUPE / SY / SYRIAN ARAB REPUBLIC
GU / GUAM / TW / TAIWAN, PROVINCE OF CHINA
GT / GUATEMALA / TJ / TAJIKISTAN
GN / GUINEA / TZ / TANZANIA, UNITED REPUBLIC OF
GW / GUINEA-BISSAU / TH / THAILAND
GY / GUYANA / TG / TOGO
HT / HAITI / TK / TOKELAU
HM / HEARD AND MC DONALD ISLANDS / TO / TONGA
VA / HOLY SEE (VATICAN CITY STATE) / TT / TRINIDAD AND TOBAGO
HN / HONDURAS / TN / TUNISIA
HK / HONG KONG / TR / TURKEY
HU / HUNGARY / TM / TURKMENISTAN
IS / ICELAND / TC / TURKS AND CAICOS ISLANDS
IN / INDIA / TV / TUVALU
ID / INDONESIA / UG / UGANDA
IR / IRAN (ISLAMIC REPUBLIC OF) / UA / UKRAINE
IQ / IRAQ / AE / UNITED ARAB EMIRATES
IE / IRELAND / GB / UNITED KINGDOM
IL / ISRAEL / US / UNITED STATES
IT / ITALY / UM / U.S. MINOR ISLANDS
JM / JAMAICA / UY / URUGUAY
JP / JAPAN / UZ / UZBEKISTAN
JO / JORDAN / VU / VANUATU
KZ / KAZAKHSTAN / VE / VENEZUELA
KE / KENYA / VN / VIET NAM
KI / KIRIBATI / VG / VIRGIN ISLANDS (BRITISH)
KP / KOREA, D.P.R.O. / VI / VIRGIN ISLANDS (U.S.)
KR / KOREA, REPUBLIC OF / WF / WALLIS AND FUTUNA ISLANDS
KW / KUWAIT / EH / WESTERN SAHARA
KG / KYRGYZSTAN / YE / YEMEN
LA / LAOS / ZM / ZAMBIA
LV / LATVIA / ZW / ZIMBABWE