function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blume, Carl Ludwig von', 1],
    ['DeFilipps, Robert A. & Krupnick, Gary A.', 2],
    ['Jarvis, Charlie', 5],
    ['Kenfack, David', 1],
    ['Linnaeus, Carolus', 5],
    ['Martin, Jon H. & Lau, Clive S. K.', 1],
    ['Mille, Christian & Henderson, Rosa C. & Cazères, Sylvie', 2],
    ['Molino, Jean-François & Sabatier, Daniel & Grenand, Pierre', 4],
    ['Monteiro, Francisca & Costa, Esperança Da & Kissanga, Raquel', 3],
    ['Pillon, Yohan', 2],
    ['Ragavan, P. & Mohan, P. M. & Jayaraj, R. S. C.', 1],
    ['Williams, David M.', 2],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);