anchor.diff:  * REPORTED GENE: Gene(s) reported by the author; "Intergenic" is used to denote a reported intergenic location (or lack of gene if it appeared that gene information was sought); “NR” is used to denote that no gene location information was reported.
   * STRONGEST SNP-RISK ALLELE: SNP(s) most strongly associated with trait + risk/effect allele (? for unknown risk allele). May also refer to a haplotype.
   * SNPS: Strongest SNP; If a haplotype is reported above, this field may include more than one rs number (multiple SNPs comprising the haplotype). Multiple SNPs may also be included if proxy SNPs are reported.
  -* RISK ALLELE FREQUENCY: Reported risk/effect allele frequency associated with strongest SNP in controls (if not available among all controls, among the control group with the largest sample size). ; If the associated locus is a haplotype the haplotype frequency will be extracted.
  +* RISK ALLELE FREQUENCY: Reported risk/effect allele frequency associated with strongest SNP in controls (if not available among all controls, among the control group with the largest sample size). If the associated locus is a haplotype the haplotype frequency will be extracted.
   * P-VALUE: Reported p-value for strongest SNP risk allele. Note that p-values are rounded to 1 significant digit (for example, a published p- value of 4.8 x 10-7 is rounded to 5 x 10-7).
   * P-VALUE (TEXT): Information describing context of p-value (e.g. females, smokers).
   * OR or BETA: Reported odds ratio or beta-coefficient associated with strongest SNP risk allele. Note that if an OR <1 is reported this is inverted, along with the reported allele, so that all ORs included in the Catalog are >1. Appropriate unit and increase/decrease are included for beta coefficients.
  
positive.code: * Missing or not applicable fields are denoted as follows: ?, allele not reported; NS, not significant (no associations at p<1.0 x 10-5 identified); NR, not reported.
  * Where multiple genetic models are available, effect sizes (OR's or beta-coefficients) are prioritized as follows: 1) genotypic model, per-allele estimate; 2) genotypic model, heterozygote estimate, 3) allelic model, allelic estimate.
  * If more than one SNP within a gene, or within a genomic region of 100kb upstream and downstream, meets the above extraction criteria, we report one SNP, unless there was evidence for an independent association.
  * Associations attributed to a combination of one or more genetic variants are denoted as such in the “Strongest SNP-Risk Allele”(e.g."3-SNP haplotype 1"). If available, rs numbers for SNPs comprising the haplotype are included in the “SNPS” field so that they are indexed and searchable using the SNP search features.
  * If the p-value, OR, and 95% CI fields are not available for the combined population, we extract estimates from the population group with the largest sample size.
  
negative.code: Studies and associations are excluded if:
  
  * The study was published in a language other than English.
  * SNPs assayed or analysed were limited to those in candidate genes.
  * The study uses customized gene-based arrays without a clearly described GWAS backbone, including those selected to replicate published GWAS findings (e.g., Metabochip, Immunochip, etc.).
  * Samples were assayed to measure somatic variation (e.g., in tumor samples).
  * The study does not include any new GWAS data.
  