[1] Karolinska Inst, Stockholm, Sweden
[2] Aga Khan Univ, Karachi, Pakistan
[3] Otto von Guericke Univ, Magdeburg, Germany
[4] Univ Copenhagen, Herlev Hosp, Herlev, Denmark
[5] Hosp Bonorino Udaondo, Buenos Aires, DF, Argentina
[6] St George Hosp, Port Elizabeth, South Africa
[7] Univ Western Ontario, London, ON, Canada
[8] Univ Malaya, Kuala Lumpur, Malaysia
[9] All India Inst Med Sci, New Delhi, India
[10] Univ Khartoum, Khartoum, Sudan
[11] Univ Hong Kong, Dept Med, Hong Kong, Hong Kong, Peoples R China
[12] Lady Reading Hosp, Peshawar, Pakistan
[13] Highland Data, Tourtoirac, France
[14] Highland Data, Amsterdam, Netherlands