Ulf Stromberg

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BACKGROUND Trends in biologic fertility are elusive. Possible negative trends in male reproductive health are still debated, and their effect on human fertility might be negligible. Time-to-pregnancy (TTP) is a functional measure of couple fecundability. METHODS We analyzed data on TTP among 832,000 primiparous women 20 years of age and older in the(More)
Advances in laboratory techniques have led to a rapidly increasing use of biomarkers in epidemiological studies. Biomarkers of internal dose, early biological change, susceptibility, and clinical outcomes are used as proxies for investigating the interactions between external and/or endogenous agents and the body components or processes. The need for(More)
There are considerable expectations about the ability of genome-wide association (GWA) studies to make exciting discoveries about the role of genes in common diseases. GWA studies may allow researchers to identify causal pathways that have not been unveiled before, thus opening new avenues to disease understanding, prevention and therapy. However, there are(More)
1 Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, United Kingdom, 2 Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London, United Kingdom, 3 Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland, 4 International Agency for Research(More)