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Cornish R, Staff AC, Boyd A, Lawlor DA, Tretli S, Bradwin G, McElrath TF, Hyer M, Hoover RN, Troisi R. Maternal reproductive hormones and angiogenic factors in pregnancy and subsequent breast cancer risk. Cancer Causes Control 2019; 30:63-74. [PMID: 30506491 PMCID: PMC6438198 DOI: 10.1007/s10552-018-1100-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 11/22/2018] [Indexed: 11/26/2022]
Abstract
PURPOSE Breast cancer risk associated with pregnancy characteristics may be mediated by maternal hormones or angiogenic factors. METHODS We conducted a prospective breast cancer case-control study among women in the Avon Longitudinal Study of Parents and Children (ALSPAC) and Norwegian Mother and Child Cohort Study (MoBa) related to maternal pregnancy prolactin (n = 254 cases and 374 controls), placental growth factor (PlGF, n = 252 and 371), soluble fms-like tyrosine kinase-1 (sFlt-1, n = 118 and 240) and steroid hormone concentrations (ALSPAC only, n = 173 and 171). Odds ratios (OR) and 95% confidence intervals (CI) for a 1 SD change in analytes were estimated using unconditional logistic regression with matching factors (cohort, mother's birth year, serum/plasma, blood collection timing) and gestational age. RESULTS Breast cancer ORs (95% CI) were 0.85 (0.51-1.43) for estradiol, 0.86 (0.67-1.09) for testosterone, 0.89 (0.71-1.13) for androstenedione, 0.97 (0.71-1.34) for hCG, 0.93 (0.75, 1.15) for prolactin, 1.00 (0.78-1.27) for PlGF and 1.91 (1.00-3.65 ALSPAC) and 0.94 (0.73-1.21 MoBa) for sFlt-1, and were similar adjusting for potential confounders. Results were similar by blood collection timing, parity, age at first birth or diagnosis, and time between pregnancy and diagnosis. CONCLUSION These data do not provide strong evidence of associations between maternal hormones or angiogenic factors with subsequent maternal breast cancer risk.
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Affiliation(s)
- Rosie Cornish
- Population Health Sciences, Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK
| | - Anne Cathrine Staff
- Division of Obstetrics and Gynecology, Oslo University Hospital and University of Oslo, P.O. Box 4956, Nydalen, 0424, Oslo, Norway
| | - Andy Boyd
- Population Health Sciences, Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK
| | - Debbie A Lawlor
- Population Health Sciences, Bristol Medical School, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol, BS8 2PS, UK
- MRC Integrative Epidemiology Unit at the University of Bristol, Oakfield House, Oakfield Grove, Bristol, BS8 2BN, UK
- NIHR Bristol Biomedical Research Centre, University of Bristol, Oakfield House, Oakfield Grove, Bristol, BS8 2BN, UK
| | - Steinar Tretli
- Cancer Registry of Norway, Institute of Population-Based Cancer Research, P.O. Box 5313, Majorstuen, 0304, Oslo, Norway
| | - Gary Bradwin
- Clinical and Epidemiologic Research Laboratory, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA, 02115, USA
| | - Thomas F McElrath
- Department of Obstetrics and Gynecology, Harvard Medical School, Brigham and Women's Hospital, 75 Francis St., Boston, MA, 02115, USA
| | - Marianne Hyer
- Information Management Services, 6110 Executive Blvd # 310, Rockville, MD, 20852, USA
| | - Robert N Hoover
- Epidemiology and Biostatistics Program, Division of Epidemiology and Genetics, National Cancer Institute, 9609 Medical Center Drive, Rockville, MD, 20850, USA
| | - Rebecca Troisi
- Epidemiology and Biostatistics Program, Division of Epidemiology and Genetics, National Cancer Institute, 9609 Medical Center Drive, Rockville, MD, 20850, USA.
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Riley V, Erzurumluoglu AM, Rodriguez S, Bonilla C. Mitochondrial DNA Haplogroups and Breast Cancer Risk Factors in the Avon Longitudinal Study of Parents and Children (ALSPAC). Genes (Basel) 2018; 9:E395. [PMID: 30071701 PMCID: PMC6115984 DOI: 10.3390/genes9080395] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 07/25/2018] [Accepted: 07/27/2018] [Indexed: 01/11/2023] Open
Abstract
The relationship between mitochondrial DNA (mtDNA) and breast cancer has been frequently examined, particularly in European populations. However, studies reporting associations between mtDNA haplogroups and breast cancer risk have had a few shortcomings including small sample sizes, failure to account for population stratification and performing inadequate statistical tests. In this study we investigated the association of mtDNA haplogroups of European origin with several breast cancer risk factors in mothers and children of the Avon Longitudinal Study of Parents and Children (ALSPAC), a birth cohort that enrolled over 14,000 pregnant women in the Southwest region of the UK. Risk factor data were obtained from questionnaires, clinic visits and blood measurements. Information on over 40 independent breast cancer risk factor-related variables was available for up to 7781 mothers and children with mtDNA haplogroup data in ALSPAC. Linear and logistic regression models adjusted for age, sex and population stratification principal components were evaluated. After correction for multiple testing we found no evidence of association of European mtDNA haplogroups with any of the breast cancer risk factors analysed. Mitochondrial DNA haplogroups are unlikely to underlie susceptibility to breast cancer that occurs via the risk factors examined in this study of a population of European ancestry.
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Affiliation(s)
- Vivienne Riley
- MSc Genomic Medicine Programme, G7, College House, St Luke's Campus University of Exeter, Exeter, Devon EX2 4TE, UK.
| | - A Mesut Erzurumluoglu
- Genetic Epidemiology Group, Department of Health Sciences, University of Leicester, Leicester LE1 7RH, UK.
- MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK.
| | - Santiago Rodriguez
- MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK.
| | - Carolina Bonilla
- MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK.
- Integrative Cancer Epidemiology Program, Population Health Sciences, Bristol Medical School, University of Bristol, Oakfield House, Oakfield Grove, Bristol BS8 2BN, UK.
- Departamento de Medicina Preventiva, Faculdade de Medicina, Universidade de São Paulo, São Paulo 01246-903, Brazil.
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Katz TA. Potential Mechanisms underlying the Protective Effect of Pregnancy against Breast Cancer: A Focus on the IGF Pathway. Front Oncol 2016; 6:228. [PMID: 27833901 PMCID: PMC5080290 DOI: 10.3389/fonc.2016.00228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Accepted: 10/11/2016] [Indexed: 01/21/2023] Open
Abstract
A first full-term birth at an early age protects women against breast cancer by reducing lifetime risk by up to 50%. The underlying mechanism resulting in this protective effect remains unclear, but many avenues have been investigated, including lobular differentiation, cell fate, and stromal composition. A single pregnancy at an early age protects women for 30-40 years, and this long-term protection is likely regulated by a relatively stable yet still modifiable method, such as epigenetic reprograming. Long-lasting epigenetic modifications have been shown to be induced by pregnancy and to target the IGF pathway. Understanding how an early first full-term pregnancy protects against breast cancer and the role of epigenetic reprograming of the IGF system may aid in developing new preventative strategies for young healthy women in the future.
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Affiliation(s)
- Tiffany A Katz
- Center for Precision Environmental Health, Baylor College of Medicine , Houston, TX , USA
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4
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Bonilla C, Lewis SJ, Rowlands MA, Gaunt TR, Davey Smith G, Gunnell D, Palmer T, Donovan JL, Hamdy FC, Neal DE, Eeles R, Easton D, Kote-Jarai Z, Al Olama AA, Benlloch S, Muir K, Giles GG, Wiklund F, Grönberg H, Haiman CA, Schleutker J, Nordestgaard BG, Travis RC, Pashayan N, Khaw KT, Stanford JL, Blot WJ, Thibodeau S, Maier C, Kibel AS, Cybulski C, Cannon-Albright L, Brenner H, Park J, Kaneva R, Batra J, Teixeira MR, Pandha H, Lathrop M, Martin RM, Holly JMP. Assessing the role of insulin-like growth factors and binding proteins in prostate cancer using Mendelian randomization: Genetic variants as instruments for circulating levels. Int J Cancer 2016; 139:1520-33. [PMID: 27225428 PMCID: PMC4957617 DOI: 10.1002/ijc.30206] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 04/04/2016] [Accepted: 04/07/2016] [Indexed: 02/02/2023]
Abstract
Circulating insulin-like growth factors (IGFs) and their binding proteins (IGFBPs) are associated with prostate cancer. Using genetic variants as instruments for IGF peptides, we investigated whether these associations are likely to be causal. We identified from the literature 56 single nucleotide polymorphisms (SNPs) in the IGF axis previously associated with biomarker levels (8 from a genome-wide association study [GWAS] and 48 in reported candidate genes). In ∼700 men without prostate cancer and two replication cohorts (N ∼ 900 and ∼9,000), we examined the properties of these SNPS as instrumental variables (IVs) for IGF-I, IGF-II, IGFBP-2 and IGFBP-3. Those confirmed as strong IVs were tested for association with prostate cancer risk, low (< 7) vs. high (≥ 7) Gleason grade, localised vs. advanced stage, and mortality, in 22,936 controls and 22,992 cases. IV analysis was used in an attempt to estimate the causal effect of circulating IGF peptides on prostate cancer. Published SNPs in the IGFBP1/IGFBP3 gene region, particularly rs11977526, were strong instruments for IGF-II and IGFBP-3, less so for IGF-I. Rs11977526 was associated with high (vs. low) Gleason grade (OR per IGF-II/IGFBP-3 level-raising allele 1.05; 95% CI: 1.00, 1.10). Using rs11977526 as an IV we estimated the causal effect of a one SD increase in IGF-II (∼265 ng/mL) on risk of high vs. low grade disease as 1.14 (95% CI: 1.00, 1.31). Because of the potential for pleiotropy of the genetic instruments, these findings can only causally implicate the IGF pathway in general, not any one specific biomarker.
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Affiliation(s)
- Carolina Bonilla
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC/University of Bristol Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom
| | - Sarah J Lewis
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC/University of Bristol Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom
| | - Mari-Anne Rowlands
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
| | - Tom R Gaunt
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC/University of Bristol Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom
| | - George Davey Smith
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC/University of Bristol Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom
| | - David Gunnell
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
| | - Tom Palmer
- Department of Mathematics and Statistics, Lancaster University, Lancaster, United Kingdom
| | - Jenny L Donovan
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
| | - Freddie C Hamdy
- Nuffield Department of Surgery, University of Oxford, Oxford, United Kingdom
| | - David E Neal
- Nuffield Department of Surgery, University of Oxford, Oxford, United Kingdom
- Surgical Oncology (Uro-Oncology: S4), University of Cambridge, Box 279, Addenbrooke's Hospital, Hills Road, Cambridge, United Kingdom
| | - Rosalind Eeles
- The Institute of Cancer Research, 15 Cotswold Road, Sutton, Surrey, SM2 5NG, United Kingdom
- Royal Marsden NHS Foundation Trust, Fulham and Sutton, London and Surrey, United Kingdom
| | - Doug Easton
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Worts Causeway, Cambridge, United Kingdom
| | - Zsofia Kote-Jarai
- The Institute of Cancer Research, 15 Cotswold Road, Sutton, Surrey, SM2 5NG, United Kingdom
| | - Ali Amin Al Olama
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Worts Causeway, Cambridge, United Kingdom
| | - Sara Benlloch
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Worts Causeway, Cambridge, United Kingdom
| | - Kenneth Muir
- University of Warwick, Coventry, United Kingdom
- Institute of Population Health, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - Graham G Giles
- The Cancer Council Victoria, 615 St. Kilda Road, Melbourne, Victoria, 3004, Australia
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, the University of Melbourne, Victoria, 3010, Australia
| | - Fredrik Wiklund
- Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
| | - Henrik Grönberg
- Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
| | - Christopher A Haiman
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California/Norris Comprehensive Cancer Center, Los Angeles, California
| | - Johanna Schleutker
- Department of Medical Biochemistry and Genetics, University of Turku, Turku, Finland
- Institute of Biomedical Technology/BioMediTech, University of Tampere and FimLab Laboratories, Tampere, Finland
| | - Børge G Nordestgaard
- Department of Clinical Biochemistry, Herlev Hospital, Copenhagen University Hospital, Herlev Ringvej 75, Herlev, DK, 2730, Denmark
| | - Ruth C Travis
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom
| | - Nora Pashayan
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Strangeways Research Laboratory, Worts Causeway, Cambridge, United Kingdom
- Department of Applied Health Research, University College London, 1-19 Torrington Place, London, WC1E 7HB, United Kingdom
| | - Kay-Tee Khaw
- Forvie Site, Cambridge Institute of Public Health, University of Cambridge, Robinson Way, Cambridge, CB2 0SR, United Kingdom
| | - Janet L Stanford
- Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington
- Department of Epidemiology, School of Public Health, University of Washington, Seattle, Washington
| | - William J Blot
- International Epidemiology Institute, 1455 Research Blvd, Suite 550, Rockville, Maryland
| | | | - Christiane Maier
- Department of Urology, University Hospital Ulm, Germany
- Institute of Human Genetics, University Hospital Ulm, Germany
| | - Adam S Kibel
- Brigham and Women's Hospital/Dana-Farber Cancer Institute, 45 Francis Street-ASB II-3, Boston, Massachussets
- Washington University, St Louis, Missouri
| | - Cezary Cybulski
- International Hereditary Cancer Center, Department of Genetics and Pathology, Pomeranian Medical University, Szczecin, Poland
| | - Lisa Cannon-Albright
- Division of Genetic Epidemiology, Department of Medicine, University of Utah School of Medicine, Salt Lake City, Utah
| | - Hermann Brenner
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Division of Preventive Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Jong Park
- Division of Cancer Prevention and Control, H. Lee Moffitt Cancer Center, 12902 Magnolia Dr, Tampa, Florida
| | - Radka Kaneva
- Molecular Medicine Center and Department of Medical Chemistry and Biochemistry, Medical University - Sofia, 2 Zdrave St, Sofia, 1431, Bulgaria
| | - Jyotsna Batra
- Australian Prostate Cancer Research Centre-Qld, Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Manuel R Teixeira
- Department of Genetics, Portuguese Oncology Institute, Porto, Portugal
- Biomedical Sciences Institute (ICBAS), Porto University, Porto, Portugal
| | - Hardev Pandha
- The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - Mark Lathrop
- Commissariat à L'Energie Atomique, Center National De Génotypage, Evry, France
- McGill University-Génome Québec Innovation Centre, Montreal, Canada
| | - Richard M Martin
- School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
- MRC/University of Bristol Integrative Epidemiology Unit, University of Bristol, Bristol, United Kingdom
- NIHR Bristol Biomedical Research Unit in Nutrition, Bristol, United Kingdom
| | - Jeff M P Holly
- NIHR Bristol Biomedical Research Unit in Nutrition, Bristol, United Kingdom
- IGFs and Metabolic Endocrinology Group, School of Clinical Sciences North Bristol, University of Bristol, Bristol, United Kingdom
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5
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Fraser A, Macdonald-Wallis C, Tilling K, Boyd A, Golding J, Davey Smith G, Henderson J, Macleod J, Molloy L, Ness A, Ring S, Nelson SM, Lawlor DA. Cohort Profile: the Avon Longitudinal Study of Parents and Children: ALSPAC mothers cohort. Int J Epidemiol 2013; 42:97-110. [PMID: 22507742 PMCID: PMC3600619 DOI: 10.1093/ije/dys066] [Citation(s) in RCA: 1613] [Impact Index Per Article: 146.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/23/2012] [Indexed: 11/23/2022] Open
Abstract
Summary The Avon Longitudinal Study of Children and Parents (ALSPAC) was established to understand how genetic and environmental characteristics influence health and development in parents and children. All pregnant women resident in a defined area in the South West of England, with an expected date of delivery between 1st April 1991 and 31st December 1992, were eligible and 13761 women (contributing 13867 pregnancies) were recruited. These women have been followed over the last 19-22 years and have completed up to 20 questionnaires, have had detailed data abstracted from their medical records and have information on any cancer diagnoses and deaths through record linkage. A follow-up assessment was completed 17-18 years postnatal at which anthropometry, blood pressure, fat, lean and bone mass and carotid intima media thickness were assessed, and a fasting blood sample taken. The second follow-up clinic, which additionally measures cognitive function, physical capability, physical activity (with accelerometer) and wrist bone architecture, is underway and two further assessments with similar measurements will take place over the next 5 years. There is a detailed biobank that includes DNA, with genome-wide data available on >10000, stored serum and plasma taken repeatedly since pregnancy and other samples; a wide range of data on completed biospecimen assays are available. Details of how to access these data are provided in this cohort profile.
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Affiliation(s)
- Abigail Fraser
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Corrie Macdonald-Wallis
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Kate Tilling
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Andy Boyd
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Jean Golding
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - George Davey Smith
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - John Henderson
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - John Macleod
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Lynn Molloy
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Andy Ness
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Susan Ring
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Scott M Nelson
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
| | - Debbie A Lawlor
- MRC Centre for Causal Analyses in Translational
Epidemiology, University of Bristol, UK, School of Social and Community
Medicine, University of Bristol, UK, School of Oral and Dental Sciences,
University of Bristol, University of Bristol, Bristol, UK and School of
Medicine, University of Glasgow, UK
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