Key points are not available for this paper at this time.
for the diligent way they did the case note abstraction; to Julian Smith for constructing and managing the database and for programming the portable computers used to collect this information; and to Susan Fritz for collecting information on policy with regard to vitamin K prophylaxis across the region and for locating the whereabouts of many of the obstetric and neonatal case notes. We are grateful to the staff of all the hospital medical records departments for facilitating access to records and to clinical colleagues, active and retired, for information on vitamin K policy. We thank Drs Olsen and Roman and Professors Golding and von Kries for providing data, and those responsible for the current national case-control study of childhood cancer for access to their data abstraction form, from which the form used in this study was developed. Copies of the full study report, as submitted to the Department of Health in May 1996, are available from the corresponding author in request.
Esmail et al. (Sat,) studied this question.