function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Breure, Abraham S. H. & Tardy, Emmanuel', 4],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 16],
    ['Chen, Ronglian & Zhang, Faqi & Chen, Shilong & Chi, Xiaofeng', 4],
    ['Egan, Paul A.', 2],
    ['Essl, F. & Stöhr, O.', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 35],
    ['Info Flora', 35],
    ['Jarvis, Charlie', 39],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 29],
    ['Lack, H. Walter', 3],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 13],
    ['Linnaeus, Carolus', 20],
    ['Machado, Angelo B. M. & Soldati Lacerda, Déborah S.', 6],
    ['Qing, Zhixing & Yan, Fangqin & Huang, Peng & Zeng, Jianguo', 3],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 5],
    ['Other (18)', 23]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=240)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);