function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 1],
    ['Fu, Long-Fei & Liao, Rui & Lan, De-Qing & Wen, Fang & Liu, Hong', 1],
    ['Fu, Long-Fei & Yang *, Tian-Ge & Lan, De-Qing & Wen, Fang', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 3],
    ['Info Flora', 2],
    ['Jang, Hyun-Do & Hyun, Chang-Woo & Ryu, Seah & Lee, Sang-Jun', 2],
    ['Jarvis, Charlie', 2],
    ['Kim, Yong-In & Cho, Seong-Hyun & Lee, Jung-Hoon & Kang, Dae-Hyun', 1],
    ['Kim, Yong-In & Shin, Jae-Seo & Lee, Sangwoo & Chen, Jia-Hui', 1],
    ['Koldaeva, Marina N.', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 3],
    ['Linnaeus, Carolus', 2],
    ['Novikov, Andriy', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);