function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Christenhusz, Maarten J. M. & Zhang, Xian-Chun', 1],
    ['Legrand, Julien & Pons, Denise & Nishida, Harufumi', 2],
    ['Likhitrakarn, Natdanai & Golovatch, Sergei I.', 13],
    ['Liu, Weixin & Golovatch, Sergei & Tian, Mingyi', 3],
    ['Marasinghe, Diana S. & Hongsanan, Sinang & Boonmee, Saranyaphat', 1],
    ['Qiao, Min & Zheng, Hua & Guo, Ji-Shu & Castaneda-Ruiz, Rafael F.', 13],
    ['Shelley, Rowland M.', 1],
    ['Tennakoon, Danushka S. & Hongsanan, Sinang & De Silva, Nimali I.', 4],
    ['Wijayawardene, Nalin N. & Dai, Dong-Qin & Premarathne, Bhagya M.', 2],
    ['Wu, Hai-Xia & Tian, Qin & Li, Wen Jing & Hyde, Kevin D.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=41)',
    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);