function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Darilmaz, Mustafa C. & Kiyak, Suat', 2],
    ['Hayashi, Masakazu & Iwata, Tomofumi & Yoshitomi, Hiroyuki', 2],
    ['Jia, Fenglong & Vondel, Bernhard van', 6],
    ['Keller, Oliver & Schnepp, Kyle E. & Ashman, Krystal L.', 7],
    ['Majka, Christopher', 2],
    ['Majka, Christopher & van Vondel, Bernhard & Webster, Reginald', 6],
    ['Perissinotto, Renzo & Bird, Matthew S. & Bilton, David T.', 1],
    ['Ramahandrison, Andriamirado Tahina & Rakouth, Bakolimalala', 1],
    ['Van Vondel, Bernhard J. & Ostovan, Hadi & Ghahari, Hassan', 3],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    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);