Ana Langer
, José Villar
, Mariana Romero
, Gustavo Nigenda
, Gilda Piaggio
, Chusri Kuchaisit
, Georgina Rojas
, Muneera Al-Osimi
, José Miguel Belizán
, Ubaldo Farnot
, Yagob Al-Mazrou
, Guillermo Carroli
, Hassan Ba'aqeel
, Pisake Lumbiganon
, Alain Pinol
, Per Bergsjö
, Leiv Bakketeig
, Jo Garcia
and Heinz Berendes^
BMC Women's Health 2002,
2:7doi:10.1186/1472-6874-2-7