function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gupta, Rajeev & Vitali, Francesco', 5],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 1],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 1],
    ['Lin, Mei-Ying & Perissinotto, Renzo & Clennell, Lynette', 2],
    ['Linnaeus, Carolus', 4],
    ['Vives, Eduard & Lin, Mei-ying', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);