Acknowledgements
We are highly grateful to the members of family NMD02 and ID01 for their
participation and co-operation in the study. We thank Dr. JG Leroy for
helpful comments. One author (NA) was a recipient of an indigenous and
an IRSIP scholarship from Higher Education Commission, Pakistan. This
study was supported by personal funds (NM), NIMAD research grant
(940714) awarded to MAF, Swedish Research Council (OM), Academy of
Finland (OM), Sigrid Jusélius Foundation (OM) and a grant from Koshish
Foundation, USA (SN).