function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aptroot, André & Souza, Maria Fernanda', 2],
    ['Chen, Pengfei & Liu, Linlin & Xie, Congmiao & Zhang, Lulu', 5],
    ['Dijkstra, Klaas-Douwe B. & Kalkman, Vincent J. & Dow, Rory A.', 1],
    ['Frisch, Andreas & Moen, Victoria Stornes & Grube, Martin', 3],
    ['Kalb, Klaus & Buaruang, Kawinnat & Mongkolsuk, Pachara', 4],
    ['Liu, Linlin & Zuo, Qijia & Xue, Junxia & Ren, Zhaojie', 4],
    ['McMullin, Richard Troy & Simon, Andrew D. F. & Brodo, Irwin M.', 4],
    ['R, Jeanne dos & Silva, eis & Aptroot, André & E, Marcela', 6],
    ['Stepanova, Dace & Moisejevs, Rolands & Nitcis, Ma ris', 3],
    ['Telfer, Angela C & Young, Monica R & Quinn, Jenna & Perez, Kate', 1],
    ['Wijayawardene, Nalin N. & Dai, Dong-Qin & Premarathne, Bhagya M.', 1],
    ['Zhurbenko, Mikhail P.', 1],
    ['van den Boom, Pieter P. G. & Clerc, Philippe & Ertz, Damien', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=36)',
    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);