function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 1],
    ['Chien-Ti, Chao & Yen-Hsueh, Tseng', 3],
    ['Doumas, Panayiotis & Goula, Katerina', 1],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 4],
    ['Hu, Yingfeng & Liu, Yujun & Ali, Maroof & Wu, Wei & Li, Xiaohong', 1],
    ['Info Flora', 3],
    ['Jarvis, Charlie', 3],
    ['Jeanmonod, Daniel', 1],
    ['Jeanmonod, Daniel & Schlüssel, André', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 3],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 5],
    ['Singh, Ankit & Singh, Harsh & Nautiyal, Mohan Chandra', 2],
    ['Xia, Maoqin & Liu, Ying & Liu, Jingjing & Chen, Donghong', 1],
    ['Zhu, Heng-Xing & Huang, Fei-Yi & Chen, Hong-Yuan', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=32)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);