function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 1],
    ['Chen, Feng & He, Hai', 1],
    ['Denk, Thomas & Sami, Marco & Teodoridis, Vasilis', 2],
    ['He, Qianqian & Zhao, Runan & He, Anguo & Zhu, Zunling', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Holstein, Norbert & Weigend, Maximilian', 83],
    ['Info Flora', 1],
    ['Jarvis, Charlie', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Kvaček, Zlatko & Teodoridis, Vasilis & Radoň, Miroslav', 1],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 4],
    ['Lu, Zhiqiang', 1],
    ['Lu, Zhiqiang & Li, Ying & Yang, Xiaoyue & Liu, Jianquan', 1],
    ['Niccolini, Gabriele & Martinetto, Edoardo & Lanini, Benedetta', 1],
    ['Suh, Soo-Jung', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=103)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);