@article{ref1,
title="Nesting sub-studies and randomised controlled trials within birth cohort studies",
journal="Paediatric and perinatal epidemiology",
year="2009",
author="Golding, Jean",
volume="23",
number="Suppl 1",
pages="63-72",
abstract="Although birth cohort studies can stand on their own, there are a number of different types of sub-studies that can add value to the overall project. These can be summarised within four main categories: (A) more detailed observations of relatively small subgroups aimed at describing mechanisms and processes; (B) nested case-control studies; (C) use of detailed observations to validate data collection by questionnaire or interview; (D) randomised controlled trials. For each category we give examples of ways in which they have been employed in current pregnancy birth cohort studies.<p /><p>Language: en</p>",
language="en",
issn="0269-5022",
doi="10.1111/j.1365-3016.2008.00994.x",
url="http://dx.doi.org/10.1111/j.1365-3016.2008.00994.x"
}