function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Guiggi, Alessandro & Mariotti, Mauro', 4],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 3],
    ['Hoxey, Paul & Gdaniec, Andrew', 2],
    ['Info Flora', 2],
    ['Jarvis, Charlie', 4],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 2],
    ['Köhler, Matias & Font, Fabián', 1],
    ['Martínez-González, César Ramiro', 1],
    ['Martínez-González, César Ramiro & Gallegos-Vázquez, Clemente', 4],
    ['Mille, Christian & Henderson, Rosa C. & Cazères, Sylvie', 2],
    ['Monteiro, Francisca & Costa, Esperança Da & Kissanga, Raquel', 1],
    ['Muñoz, Fermín Mercado & Luz, José Luis León De La', 1],
    ['Oliveira, Anabela Silveira De & Pontes, Rodrigo Corrêa', 1],
    ['Sokoloff, Paul C. & Freebury, Colin E. & Hamilton, Paul B.', 4],
    ['Suh, Soo-Jung', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    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);