function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 10],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 5],
    ['Callmander, Martin W. & Durbin, Olivier D. & Lack, Hans-Walter', 1],
    ['Deniz, Ismail Goekhan & Aykurt, Candan & Genc, Ilker', 1],
    ['Domina, Gianniantonio & Astuti, Giovanni & Bacchetta, Gianluigi', 14],
    ['Doumas, Panayiotis & Goula, Katerina', 1],
    ['Essl, F. & Stöhr, O.', 1],
    ['Fassou, Georgia & Korotkova, Nadja & Nersesyan, Anush', 10],
    ['Hamzaoglu, Ergin & Koc, Murat & Aksoy, Ahmet', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 14],
    ['Info Flora', 25],
    ['Jarvis, Charlie', 21],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 14],
    ['Linnaeus, Carolus', 18],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 24],
    ['Other (5)', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=165)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);