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M Valbuena
Department of Biostatistics, Wilmer Institute, The Johns Hopkins University, School of Hygiene and Public Health, Baltimore, Maryland 21205-2179, USA.
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K Bandeen-Roche
Department of Biostatistics, Wilmer Institute, The Johns Hopkins University, School of Hygiene and Public Health, Baltimore, Maryland 21205-2179, USA.
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G S Rubin
Department of Biostatistics, Wilmer Institute, The Johns Hopkins University, School of Hygiene and Public Health, Baltimore, Maryland 21205-2179, USA.
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B Munoz
Department of Biostatistics, Wilmer Institute, The Johns Hopkins University, School of Hygiene and Public Health, Baltimore, Maryland 21205-2179, USA.
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S K West
Department of Biostatistics, Wilmer Institute, The Johns Hopkins University, School of Hygiene and Public Health, Baltimore, Maryland 21205-2179, USA.