[1] Soc Healthcare Epidemiol Amer, Arlington, VA USA
[2] Univ Stellenbosch, Cape Town, South Africa
[3] Natl Ctr Epidemiol, Budapest, Hungary
[4] George Washington Univ, Washington, DC USA
[5] BP Koirala Inst Hlth Sci, Dharan, Nepal
[6] Markhot Ferenc Teaching Hosp & Outpatient Clin, Eger, Hungary
[7] Natl Kapodistrian Univ, Athens Sch Med, Athens, Greece
[8] Gauhati Med Coll & Hosp, Gauhati, India
[9] Hosp Italiano Buenos Aires, Buenos Aires, DF, Argentina
[10] George Washington Univ, Childrens Natl Med Ctr, Washington, DC USA