{"schema_version":"1","generated_at":"2026-10-29T05:49:59.705Z","data_as_of":null,"url":"https://www.findmykol.com/kol/jan-verhaar","json_url":"https://www.findmykol.com/kol/jan-verhaar/profile.json","record_kind":"basic","profile_kind":"research","person":{"slug":"jan-verhaar","name":"Jan A.N. Verhaar","specialty":"Medicine","therapeutic_area":"Rheumatology/Immunology","therapeutic_areas":["Rheumatology/Immunology"],"institution":"Erasmus MC","institution_url":"https://www.findmykol.com/institution/erasmus-mc","register":{"country":"NL"}},"identifiers":{"orcid":"0000-0003-3016-9600","openalex":"A5035697100"},"summary":"Jan A.N. Verhaar is a Rheumatology/Immunology researcher affiliated with Erasmus MC. OpenAlex indexes 578 publications with 30,576 citations (h-index 99); ClinicalTrials.gov lists 1 registered study matched to this name.","overview":null,"focus":{"indications":[],"research_topics":["Rheumatology/Immunology"]},"scholarship":{"works_count":578,"cited_by_count":30576,"h_index":99,"source":"works"},"trials":{"shown":0,"withheld":0,"rows":[],"source":"trials"},"payments":{"note":"Not applicable. This profile is anchored outside the United States, where CMS Open Payments and Medicare prescribing do not report."},"similar":[{"name":"M. Arfan Ikram","slug":"m-ikram","institution":"Erasmus MC","url":"https://www.findmykol.com/kol/m-ikram","json_url":"https://www.findmykol.com/kol/m-ikram/profile.json"},{"name":"Juanita A. Haagsma","slug":"juanita-haagsma","institution":"Erasmus MC","url":"https://www.findmykol.com/kol/juanita-haagsma","json_url":"https://www.findmykol.com/kol/juanita-haagsma/profile.json"},{"name":"Rudolf A. de Boer","slug":"rudolf-boer","institution":"Erasmus MC","url":"https://www.findmykol.com/kol/rudolf-boer","json_url":"https://www.findmykol.com/kol/rudolf-boer/profile.json"},{"name":"Ron A. M. Fouchier","slug":"ron-fouchier","institution":"Erasmus MC","url":"https://www.findmykol.com/kol/ron-fouchier","json_url":"https://www.findmykol.com/kol/ron-fouchier/profile.json"},{"name":"David Felson","slug":"david-felson","institution":"Boston University","specialty":"Rheumatology","url":"https://www.findmykol.com/kol/david-felson","json_url":"https://www.findmykol.com/kol/david-felson/profile.json"},{"name":"Marc Hochberg","slug":"marc-hochberg","institution":"University of Maryland School of Medicine","specialty":"Rheumatology","url":"https://www.findmykol.com/kol/marc-hochberg","json_url":"https://www.findmykol.com/kol/marc-hochberg/profile.json"},{"name":"Philip Mease","slug":"philip-mease","specialty":"Rheumatology","url":"https://www.findmykol.com/kol/philip-mease","json_url":"https://www.findmykol.com/kol/philip-mease/profile.json"},{"name":"Michelle Petri","slug":"michelle-petri","institution":"Johns Hopkins University School of Medicine","specialty":"Rheumatology","url":"https://www.findmykol.com/kol/michelle-petri","json_url":"https://www.findmykol.com/kol/michelle-petri/profile.json"}],"coverage":{"note":"A basic record from the physician directory. Sections absent here were not yet checked for this person, so absence means not yet looked, never none found.","not_yet_checked":["funding","congress","network","presence","recognition"]},"not_included":{"note":"This document is the public layer: neutral facts cited to their source. Judgments (influence tier, archetype, trajectory commentary) and the itemized rows past each section's public teaser are account features and are not served here or to crawlers.","withheld_rows":{}},"sources":{"orcid":{"name":"ORCID","url":"https://orcid.org","provides":"The verified researcher identity that anchors authorship"},"works":{"name":"OpenAlex","url":"https://openalex.org","provides":"Citations, h-index, research topics, most-cited works and congress abstracts"},"trials":{"name":"ClinicalTrials.gov","url":"https://clinicaltrials.gov","provides":"Investigator roles on registered clinical studies"}},"methodology_url":"https://www.findmykol.com/about#methodology"}